Download science booklet grade 6 - Cairo Modern International School

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CAIRO MODERN INTERNATIONAL
SCHOOL
STUDENT'S
NAME:
....................................................
STUDENT'S NAME:
SCIENCE BOOKLET
GRADE ....................................................
6
STUDENT'S
NAME:
QUARTER
3
....................................................
STUDENT'S NAME:
....................................................
SCIENCE DEPARTMENT
GRADE 6
QUARTER 3
WORKSHEET
UNIT 1
LESSON 1
MULTIPLE CHOICE
1. During a science experiment, a student dropped a metal ball from a height of 150 m. The
graph shows the distance the metal ball traveled from its initial position to where it hit the
ground.
What information does the graph give you about the speed of the metal ball over time?
A.
B.
C.
D.
The ball travels at a constant speed.
The speed of the ball increases over time.
The speed of the ball decreases over time.
The speed of the ball increases at first, and then decreases as time
increases.
2. In a swimming race, Miho swam the first 50 m in 42 s. She swam the second 50 m in 40 s.
What was Miho’s average speed during the race?
A.
B.
C.
D.
0.82 m/s
1.19 m/s
1.22 m/s
1.25 m/s
2
3. Which unit is used to measure distance?
A.
B.
C.
D.
Grams
Seconds
Milliliters
Centimeters
4. An athlete is running a 5-km race at an average speed of 8 km/h. She has to stop to tie her
shoe. After tying her shoe, she continues running at 8 km/h. Why would her average speed
for the entire race be less than 8 km/h?
A. The total distance she traveled was longer than 5 km.
B. The total distance she traveled was shorter than 5 km.
C. The total time she took to complete the race increased because she
stopped.
D. The total time she took to complete the race decreased because she
stopped..
5. An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is
needed to determine the velocity of the elevator?
A.
B.
C.
D.
the direction the elevator traveled
how long the elevator was stationary
how many times the elevator stopped
the total mass of the elevator plus anything in it
6. Which of the following is a definition of motion?
A.
B.
C.
D.
a change in position over time
the speed and direction of an object
the length of the path between points
a location compared to other locations
7.Three runners compete in a 400-m race on an oval-shaped running track. At a certain time, one
runner is 15 m behind the finish line. Which term describes the finish line?
A.
B.
C.
D.
total distance
relative motion
reference point
change in position
3
8. The graph below shows the distance a car traveled in 5 seconds while moving on a freeway.
What was the car’s average speed?
A.
B.
C.
D.
0 m/s
14 m/s
28 m/s
30 m/s
9. Joanna’s family drove 360 km on a trip. The graph below represents their motion.
What was the average speed during the last 3 h of the trip?
A.
B.
C.
D.
45 km/h
60 km/h
120 km/h
180 km/h
4
10. A student allowed four different objects to roll down a ramp. He measured the distance each
object rolled and the time until each object came to a stop. He plotted each point and
connected it with a line from origin of the graph.
Which object had the greatest average speed?
A.
B.
C.
D.
object A
object B
object C
object D
11. Montez read that bobcats can reach speeds of up to 30 mi/h. What does the speed of a
bobcat indicate?
A.
B.
C.
D.
the time it takes to reach its maximum speed
the total amount of time it travels in one direction
the distance it travels to move between two points
the distance it can travel in a certain amount of time
12. Tyrone wants to determine how fast a bowling ball travels when it is bowled. He uses a
stopwatch to record, in seconds, the time it takes for the bowling ball to reach the pins.
Which unit would be most appropriate to measure the length of the bowling lane?
A.
B.
C.
D.
meters
kilometers
millimeters
centimeters
5
13. The graph below represents the time and distance traveled by four different toy cars.
What was the average speed of car D?
A.
B.
C.
D.
0.3 ft/s
2 ft/s
3 ft/s
12 ft/s
14. Which two measurements are needed to determine the speed of an object?
A.
B.
C.
D.
position and time
distance and time
position and direction
distance and direction
15. Which of the following would best be measured in kilometers?
A.
B.
C.
D.
the height a golf ball travels into the air
the distance a snail moves each second
the length between two walls of a room
the distance a plane travels during a flight
16. An airplane leaves New York to fly to Los Angeles. It travels 3,850 km in 5.5 hours. What is
the average speed of the airplane?
A.
B.
C.
D.
700 km
700 hours
700 km/hour
7000 hours/km
6
17. This distance-time graph shows the speeds of four toy cars.
Which car is the fastest?
A.
B.
C.
D.
Car 1
Car 2
Car 3
Car 4
ESSAY
1. What is the difference between the speed of an object, the velocity of an object, and the of
an object?
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GRADE 6
WORKSHEET
UNIT 1
LESSON 2
MULTIPLE CHOICE
1. Rheka conducted an experiment with a radio-controlled toy car. The sketches show her
findings.
What is the average acceleration of the car?
A.
B.
C.
D.
5 m/s2
10 m/s2
15 m/s2
20 m/s2
2. A car travels in a straight line. The driver applies the brakes and comes to an abrupt stop.
During braking, what happens to the velocity and acceleration vectors?
A. They point in opposite directions.
B. They point in the same direction.
C. They are at right angles to each other.
D. They create centripetal acceleration.
3.What is acceleration?
A.
B.
C.
D.
the direction of motion
the rate at which velocity changes
an object’s speed multiplied by its mass
the rate at which an object’s position changes
4.Measuring acceleration requires appropriate units. Which are the SI units for acceleration?
A.
B.
C.
D.
N
m/s
m/s2
kg·m/s
8
5. Which of the following is an example of acceleration?
A.
B.
C.
D.
A boat sits on a boat trailer.
A car moves in a straight line at 60 km/hr.
A plane moves in air at a steady speed of 850 km/hr.
A bus moves on a straight road and then makes a right turn.
6. Katrina rode her bicycle to the library. The following graph shows part of Katrina’s ride after
she started.
What was Katrina’s acceleration during the time represented on the graph?
A.
B.
C.
D.
The acceleration was zero.
The acceleration was 10 m/s.
The acceleration was 10 m/s2.
The acceleration was 3.3 m/s2.
7. Which of the following is an example of an acceleration vector?
A.
B.
C.
D.
5 m/s
5 m/s2
5 m/s2 south
5 m/s south
8. How can you find the average acceleration of an object?
A. Multiply its mass by its speed.
B. Divide its distance by the time it took to travel that distance.
C. Subtract the final position from the initial position and multiply by change
in time.
D. Subtract the initial velocity from the final velocity and then divide by the
change in time.
9
9. Elizabeth is a wildlife biologist. She traveled by boat in the Everglades to observe alligators.
The following graphs show the motion of her boat at several times during the trip.
Which graph shows her boat traveling when it is not accelerating?
A.
B.
C.
D.
graph A
graph B
graph C
graph D
10. An experimenter records data for the speed and time of rolling carts traveling along a track.
The table shows the data for four trials.
Trial 4
Speed (m/s)
Trial 3
Speed (m/s)
1
2
8
20
10
9
8
7
Trial 2
Speed
(m/s)
4
4
4
4
Trial 1
Speed
(m/s)
2
5
10
15
Time
(s)
0
1
2
3
In which trial did the cart experience the greatest average acceleration?
A.
B.
C.
D.
trial 1
trial 2
trial 3
trial 4
11. Which is an example of centripetal acceleration?
A.
B.
C.
D.
an object at rest
an object moving in a circle at 20 m/s
an object moving at 20 m/s backward, then 20 m/s to the right
an object moving in a straight line at a steady speed of 20 m/s forward
10
12. An experimenter records data for the speed and time of rolling carts. Four different trials
were conducted. The table shows the data for all four trials.
Trial 4
Speed
(m/s)
1
2
8
20
Trial 3
Speed
(m/s)
10
9
8
7
Trial 2
Speed
(m/s)
4
4
4
4
Trial 1
Speed
(m/s)
2
5
10
15
Time
(s)
0
1
2
3
In all trials, the cart accelerated. In three of the trials, the cart moved in a straight line. In
which trial did the cart experience centripetal acceleration?
A.
B.
C.
D.
trial 1
trial 2
trial 3
trial 4
13. Which of the following describes an object moving in a circle steadily?
A.
B.
C.
D.
change in speed only
change in direction only
no change in speed or direction
change in speed and change in direction
14. Which scenario does not describe an example of acceleration?
A.
B.
C.
D.
A car increases its speed while turning to the left.
A car decreases its speed while driving straight ahead.
A car maintains a constant speed while turning to the right.
A car maintains a constant speed while driving straight ahead
15. Julia is in a car with her father. The car is undergoing centripetal acceleration. What is
happening to the car?
A.
B.
C.
D.
The car is changing direction at a constant speed.
The car is changing direction and speeding up.
The car is stopping suddenly.
The car is slowing down.
11
ESSAY
1. What is the difference between the speed of an object, the velocity of an object, and the
acceleration of an object?
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GRADE 6
WORKSHEET
UNIT 1
LESSON 3
MULTIPLE CHOICE
1. Which of the following is considered a contact force?
A.
B.
C.
D.
the force between two magnets
the gravitational pull of a planet
friction between an object and air
the force between two charged particles
2. Which term describes the tendency of a moving object to continue moving at the same
velocity unless an unbalanced force acts on it?
A.
B.
C.
D.
Inertia
Friction
Gravity
acceleration
3. An index card is placed across the top of a drinking glass. A coin is then placed on top of the
index card. A student quickly flicks the card sideways off the glass. Which of the following
explains why the coin falls into the glass rather than moving to the side with the index card?
A.
B.
C.
D.
Newton’s first law of motion
Newton’s second law of motion
Newton’s third law of motion
Newton’s law of universal gravitation
4. Which of the following is an example of a force that acts at a distance?
A.
B.
C.
D.
An airplane experiences friction as it moves through air.
A book experiences a normal force as it rests on a table.
A soccer ball experiences a force as it is kicked across a field.
A magnet is pushed away when it is brought near the end of another
magnet.
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5. Why is the magnetic force considered to be an action-at-a-distance force?
A.
B.
C.
D.
Magnets must be far apart in order to exert a force.
Magnets do not have to touch each other to experience a force.
Magnets push each other apart to increase the distance between them.
Magnets must be large in size in order to exert a force that is strong
enough to notice.
6.Why is the friction force considered to be a contact force?
A.
B.
C.
D.
Friction affects only solid objects.
Friction always acts in the same direction.
Friction is produced when objects slide past one another.
Friction acts in a direction opposite to the direction of an object’s motion.
7. A box of books is on the floor. The following picture shows a push and a pull acting on the
box.
What is the net force toward the right on the box?
A.
B.
C.
D.
0N
50 N
100 N
2,500 N
8.Jessica has two balls. One ball has a mass of 1 kg. The other ball has a mass of 2 kg. She pushes
each with a force of 100 N. How does the acceleration of the two balls compare?
A.
B.
C.
D.
The 1-kg ball accelerates the same as the 2-kg ball.
The 1-kg ball accelerates half as much as the 2-kg ball.
The 1-kg ball accelerates twice as much as the 2-kg ball.
The 1-kg ball accelerates four times as much as the 2-kg ball.
14
9. During a baseball game, a hitter strikes the ball with a bat. When this happens, the ball and
the bat exert a force on each other. Why does the ball accelerate away from the bat more
than the bat accelerates away from the ball?
A. The ball has less mass, so it exerts less force on the bat.
B. The ball has greater velocity before the collision, so the force affects the
ball more than it affects the bat.
C. The bat exerts more force than the ball because the batter is exerting a
force on the bat as it hits the ball.
D. The ball has less mass, so the equal force on the ball and the bat causes
greater acceleration of the ball.
10.The diagram below shows the forces acting on a sneaker. As the force F is applied, the sneaker
does not move.
Which statement below correctly describes the forces?
A.
B.
C.
D.
The net force is acting in an upward direction.
The net force is acting to the left.
The net force is moving to the right.
The net force is zero and all the forces are balanced.
11. Consider two objects whose masses are 100 g and 200 g. The smaller object strikes the larger
object with a force of 500 N. According to Newton’s third law of motion, what force does the
larger object exert on the smaller object?
A.
B.
C.
D.
250 N
500 N
1,000 N
1,500 N
15
12.Imagine a box floating in space. The following picture shows all the forces acting on this box.
What is the vertical force on this box?
A.
B.
C.
D.
50 N upward
100 N upward
50 N downward
100 N downward
13.A moving object collides with a stationary object. Which of the following statements is true
according to Newton’s third law of motion?
A. Each object exerts a force on the other, and the two forces are equal and
in opposite directions.
B. Each object exerts a force on the other, and the two forces are the same
in magnitude and direction.
C. Each object exerts a force on the other, and the two forces are
proportional to the masses of the objects.
D. The moving object exerts a force on the stationary object, but the
stationary object does not exert a force on the moving object.
14. A soccer player kicks a ball. According to Newton’s third law of motion, the player’s foot
exerts a force on the ball. The ball exerts a force on the foot. Why don’t the forces cancel out
to result in a net force of zero?
A.
B.
C.
D.
The ball moves before the forces can cancel out.
The forces become unbalanced due to air resistance.
The force on the ball is greater than the force on the foot.
The forces are exerted on different objects so they are not balanced
forces.
16
15. Two equal forces act in opposite directions on object A. Two unequal forces act in opposite
directions on object B. If these are the only forces acting on objects A and B, which of the
following conclusions is true?
A.
B.
C.
D.
Only object A will accelerate.
Only object B will accelerate.
Both object A and object B will accelerate.
Neither object A nor object B will accelerate.
SHORT ANSWER
1. Marek is trying to push a box of sports equipment across the floor. The arrow on the box is a
vector representing the force that Marek exerts.
What are the forces acting upon the box?
2. What does the formula F = ma mean, and which of Newton’s three laws does it describe?
ESSAY
1. The following diagram shows the forces acting on a box.
17
Explain how you calculate the net force in any direction on the box.
___________________________________________________
___________________________________________________
Suppose an upward force of 15 N is added to the box. What will be the net vertical force on
the box?
___________________________________________________
___________________________________________________
What force could be applied to the box to make the net force in the horizontal direction
zero? Explain.
___________________________________________________
___________________________________________________
Suppose a force of 25 N to the right is added to the box. What will be the net force to the
right?
___________________________________________________
____________________________________________________
2. The following diagram shows the forces acting on a box.
What do the length and the direction of the arrows in the diagram represent?
___________________________________________________
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Are any of the forces acting on the box balanced? How do you know?
___________________________________________________
___________________________________________________
Are any of the forces acting on the box unbalanced? How do you know?
___________________________________________________
___________________________________________________
Describe the motion of the box as a result of the forces acting on it.
___________________________________________________
___________________________________________________
19
GRADE 6
WORKSHEET
UNIT 2
LESSON 1
MULTIPLE CHOICE
1.A boy is riding a skateboard. Why does the skateboard have the ability to do work?
A. because it can slow down
B. because it can change direction
C. because the force applied by the rider acts in the same direction as the
motion of the skateboard
D. because the force applied by the rider acts in the opposite direction as the
motion of the skateboard
2. Consider the following two situations:
1. A girl kicks a ball across a field.
2. A boy holds a suitcase by his side.
Which of the following responses is correct about the two situations?
A.
B.
C.
D.
Work is done is both situations.
No work is done in either situation.
Work is done in the first situation, but not the second.
Work is done in the second situation, but not the first.
3. The table shows different forces and distances that employees in a factory used to lift boxes.
Distance
(m)
1.5
2.5
1.0
Force
(N)
24
18
25
Ayanna
Rafael
Cassie
2.0
16
Michael
Employee
Which employee did the most work while lifting boxes?
A.
B.
C.
D.
Cassie
Rafael
Ayanna
Michael
20
4. Which of the following best defines energy?
A.
B.
C.
D.
the ability to do work
the resistance to motion
how fast an object moves
amount of force in a given time
5. Which of the following describes a transfer of energy through work?
A.
B.
C.
D.
A student carries a heavy backpack one km.
A laboratory burner is used to heat 250 mL of water to boiling.
A woman pushes a luggage cart in an airport over a distance of 100 m.
A man pushes on a large piece of furniture for 15 min, but it does not
move.
6. A lightbulb uses 2,000 J of energy in 1 min and 20 s. What is the power of the lightbulb?
A.
B.
C.
D.
25 W
50 W
60 W
100 W
7. Which of the following is an example of energy being used to do work?
A.
B.
C.
D.
A woman sits on the edge of a bench.
A soccer ball rests at the top of a hill.
A boy holds a fishing pole over the water.
A girl climbs up a ladder holding a paint can.
8. The table shows different forces and distances that employees in a factory used to lift boxes.
Distance
(m)
1.5
2.5
1.0
2.0
Force
(N)
24
18
25
16
Employee
Ayanna
Rafael
Cassie
Michael
Which employee did the least work while lifting boxes?
A.
B.
C.
D.
Cassie
Rafael
Ayanna
Michael
21
9. Dr. Hernandez and Dr. Osman measure the power of a new type of lightbulb. Both
researchers find the energy measurement as 90 J for a time of 30 s. However, Dr. Hernandez
determines that the power is 3 J/s, and Dr. Osman says that the power is 2700 J/s. Why do
the results differ?
A. Dr. Osman has an incorrect numerical value but a correct unit.
B. Dr. Hernandez has the correct numerical value but an incorrect unit.
C. The units are correct for Dr. Osman’s results but Dr. Hernandez divided
the units instead of multiplying them.
D. The units are correct for Dr. Hernandez’s results but Dr. Osman multiplied
the units instead of dividing them.
10. A group of wind turbines operates in an open field. Which statement about the wind
turbines is true?
A.
B.
C.
D.
The wind turbines produce movement of air that does work.
The wind turbines do work by using electricity to produce power.
The wind turbines cannot do work because they are fixed in one spot.
The wind turbines do work generating electricity by harnessing wind
energy.
11. A student is planning a camping trip and wants to take a few electronic devices along. Her
flexible portable solar panel converts electromagnetic energy from the sun into electrical
energy at a rate of 21,600 J/h. Which devices could she charge with it at one time?
Power Needed
2W
5W
7W
A.
B.
C.
D.
Device
Cell phone charger
PDA charger
AA/AAA battery charger
all three devices
the AA/AAA battery charger
both the cell phone charger and the PDA charger together
the PDA charger or the cell phone charger separately, but not both
together
22
12.A baseball player used energy to hit a ball out of the park. What is true about what took place?
A.
B.
C.
D.
The ball lost energy when it was struck by the bat.
Force was applied in a different direction than motion.
Work was done on the ball through the transfer of energy.
No power was used because the action happened so quickly.
13. Four movers pushed different boxes across a floor for the same distance. The table shows
how much force each mover used, the time it took to move the box, and the mass of the
box.
Mass of Box
(kg)
15
15
18
22
Time
(s)
5
10
3
10
Force
(N)
155
120
90
160
Mover
Akira
Maddie
Jayden
Hamid
Which mover did the most work moving a box?
A.
B.
C.
D.
Akira
Hamid
Jayden
Maddie
14. Four movers pushed different boxes across a floor for the same distance. The table shows
how much force each mover used, the time it took to move the box, and the mass of the
box.
Mass of Box
Time
Force
Mover
(kg)
(s)
(N)
15
5
155
Akira
15
10
120
Maddie
18
3
90
Jayden
22
10
160
Hamid
Which mover did the least work moving a box?
A.
B.
C.
D.
Akira
Hamid
Jayden
Maddie
23
15. A girl uses 60 J of energy to move a box from the floor to a shelf. How much power does she
use if it takes her 3 s to move the box?
A.
B.
C.
D.
15 W
20 W
90 W
180 W
16. A girl uses 60 J of energy to move a box from the floor to a shelf. If she uses 20 W of power
to move the box, how many seconds did it take her to move the box?
A.
B.
C.
D.
2
3
30
120
17. Energy is the ability to do work. In which of these examples does using energy cause work to
be done?
A.
B.
C.
D.
A girl kicks a ball across a field.
A boy holds a suitcase by his side.
A pitcher holds a ball in his glove.
A woman reads instructions for assembling her bicycle.
SHORT ANSWER
1. Work is defined as the use of force to move an object in the direction of that force and is
equal to the force times the distance the object moved. How do energy and power relate to
work?
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ESSAY
1. Energy can be used to do work using many processes. Complete the chart by identifying the
energy conversion or conversions that take place for each example given. The first example
is done for you.
24
Energy conversion(s)
Chemical energy from food is converted to
mechanical energy you can use to do work.
Example
You get energy when you eat and digest
food.
Energy from a battery powers a
flashlight.
Energy from water behind a dam lights a
home.
Differences in temperatures cause wind.
A drum set causes dishes to rattle.
OTHER
1. ________________________ is the use of force to move an object in the direction of the
force.
25
Science department
Final revision sheet grade 6
Quarter 3
Motion and Forces
Fill in each blank with the term that best completes the following sentences.
1. The ________________________ of an object describes the speed and the direction in which it is
going.
2. The change in the velocity of an object is defined as its ________________________.
3. An object that is traveling around another body in space is in ________________________ around
that body.
4. The ________________________ on an object is the combination of all the forces acting on the
object.
Key Concepts
Read each question below, and circle the best answer.
5. An airplane leaves New York to fly to Los Angeles. It travels 3,850 km in 5.5 hours. What is the
average speed of the airplane?
A. 700 km
C. 700 km/hour
B. 700 hours
D. 700 hours/km
6. This distance-time graph shows the speeds of four toy cars.
Which car is the fastest?
A. Car 1
C. Car 3
B. Car 2
D. Car 4
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7. The diagram below shows the forces acting on a sneaker. As the force F is applied, the sneaker
does not move.
Which statement below correctly describes the forces?
A. The net force is acting in an upward direction.
B. The net force is acting to the left.
C. The net force is moving to the right.
D. The net force is zero and all the forces are balanced.
8. Julia is in a car with her father. The car is undergoing centripetal acceleration. What is happening
to the car?
A. The car is changing direction at a constant speed.
B. The car is changing direction and speeding up.
C. The car is stopping suddenly.
D. The car is slowing down.
Critical Thin king
Answer the following questions in the space provided.
9. Marek is trying to push a box of sports equipment across the floor. The arrow on the box is a
vector representing the force that Marek exerts.
What are the forces acting upon the box?
___________________________________________________________________________________
___________________________________________________________________________________
27
___________________________________________________________________________________
10. What does the formula F = ma mean, and which of Newton’s three laws does it describe?
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
Answer the following question in the space provided.
11. What is the difference between the speed of an object, the velocity of an object, and the acceleration of an
object?
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
28