Download Name

Name
Date
Class
Overview
Motion
\ the terms below.
Directions: Complete the concept map using
An object’s
acceleration
is its rate of
change of
1.
which depends
on its
2.
and
4.
which is its rate
of change of
3.
Directions: Circle the term in parentheses that correctly completes the sentence.
5. As a car follows a bend in the road going to the left, its centripetal acceleration is
to the (right/left).
6. The greater a boulder’s mass, the (greater/less) inertia it has.
7. Displacement depends on an object’s distance and (speed/direction) compared to
a starting point.
8. An automobile that slows down when approaching a stop sign has (negative,
positive) acceleration.
Motion
15
Name
Date
Class
Section 1 ■ Describing Motion
Read section 1, define all vocab as you read
What is a reference point?
What is the difference between distance and displacement?
What unit is used to measure distance and displacement?
The arrows in fig 4 are called vectors. The length of the arrow represents the magnitude of the
displacement or distance, the head of the arrow indicated the direction, Distance and displacement are
added by vector addition. The rules for vector addition are in table 1
What is the equation for speed. What are the units
You should be able to solve for any variable (speed, distance and time) using the speed equation
What would a graph of constant speed look like? How about changing speed?
What are 2 ways of expressing changing speed
Supposed you are taking a trip and want to calculate your average speed. Should you include the half
hour lunch break in your total time?
When graphing motion, which variable goes on the x axis, which on the y axis
How can speed be calculated from a distance time graph?
How do you calculate the slope of a line?
Directions: For each of the following, write the letter of the term or phrase that best completes the sentence.
1. A sprinter runs 200 m west and 100 m east. Her displacement is _____.
a. 300 m
b. 100 m west
2. Speed can be calculated by dividing distance by _____.
a. time
b. displacement
3. The speed of a motorcycle at a particular moment is its _____ speed.
a. average
b. instantaneous
4. Earth’s plates move only a few _____ per year.
a. centimeters
b. meters
5. Two cars are each traveling at 72 km/h. One car is traveling northeast,
and the other is traveling south. The two cars have different _____.
a. velocities
b. speeds
Directions: Look at the graph. Match the letters in the graph to the sentences below.
6. Ruth stops for 10 minutes to speak to a friend.
7. She walks at a constant speed of 80 m/min.
8. She jogs 600 m in 5 minutes.
Section 2
read and do vocab
Compare and contrast speed and velocity
Describe and explain the velocity of a car racing around a circular track
How do we know that the earth’s plates move?
Compare the velocity of the plates at the San Andres Fault to those at the Australian plate
How does your reference point affect your perception of relative motion?
Does a heavier object always have more momentum? Explain
Directions: Answer the following questions.
1. Calculate the average velocity in m/y of a tectonic plate that has travelled 9000 km to
the south in 60 million years.
2. Explain why it is important to identify a reference point for any description of
motion.
3. How is it possible for two objects to have the same momentum, but different
velocities? Give an example.
4. A table tennis ball with a mass of 0.003 kg and a soccer ball with a mass of
0.43 kg are both set in motion at 16 m/s. Calculate and compare the momenta of
both balls.
Section 3
read and do vocab
How are velocity time and acceleration related?
Name 3 ways an object can accelerate
On a speed time graph, what variable is on the x axis, what variable is on the y axis. How is this different
form a distance time graph
How can you calculate the acceleration form a speed time graph
Describe the scceleration represented by an ascending line, a flat line and a descending line.Describe
the numerical value for the slopes of those lines.
What is the equation for calculating acceleration.
What do vf and vi represent
Is it possible to have a negative acceleration? Describe the motion of an object with negative
acceleration
Is an object with zero acceleration moving?
For circular motion, because the acceleration and motion are not in the same direction, they are
perpendicular to each other (see fig 17), you canntot use the acceleration formula for an object traveling
in circular motion.
Fig 17. The velocity is represented by the red arrows, the change in direction is the blue arrow. Notice
that the red and blue arrows are perpendicular to each other
Centripetal force is always in the same direction as the velocity. Centripetal force is directed toward the
center of the circle.
What is projectile motion
A projectile will have constant horizontal motion, but has increasing vertical motion due to gravity. The
curved path that results is due to the combination of the horizontal and vertical motion
If I fire a bullet from a gun and at the same time drop a bullet from my hand, which will strike the ground
first?
Directions: Complete the paragraph by filling in the blanks using the terms listed below.
Acceleration occurs when an object’s 5. ____________________ changes.
When an object speeds up, it has 6. ____________________ acceleration. When
an object’s final velocity is less than its initial velocity, however, it has 7.
____________________ acceleration. An object that is changing
8. ____________________ is accelerating, even if its speed remains the same.
Acceleration can be calculated by dividing the change in velocity by the
9. ____________________ interval in which the change occurred. The SI unit
of 10. ____________________ is m/s2.
Motion
17
Name
Date
Class
Key Terms
Motion
Directions: Use the clues below to complete the crossword puzzle.
Across
1. includes both the speed of an object
and the direction if it moving
4. a measure of how far an object has
moved from a starting point
5. the rate of change of velocity
6. the distance an object travels per
unit of time
7. ______ is the acceleration towards
the inside of a curved path.
10. the product of mass and velocity
18 Motion
Down
2. The rate of change in position at a
given point in time is ______
speed.
3. the tendency of an object to resist
any change in its motion
8. ______ speed is equal to the total
distance traveled divided by the
total time of travel
9. the distance and direction of an
object from a starting point
11. Change in velocity is the final speed
minus the ______ speed.