Download worksheet 4

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DATE
NAME
CLASS
.;"Accelerated Motion
Solve the puzzle below by writing the term in the diagram that best completes each statement. You will find another
term spelled vertically in the black box.
1.
2.
3.
4.
5.
6.
7.
8.
9.
-, 10.
,
11.
12.
"
1. Force equals __ times acceleration.
2. Newton's __ law of motion states that a net force acting on an object causes the object to
accelerate in the direction of the force.
3. The law of inertia states that when the forces acting upon an object are __ , the motion of
the object will not change.
4. The unit of force is the __ .
5. Gravity causes __ objects to accelerate.
6. The force of gravity acting upon the mass of an object is the object's __ .
7. The __ the force acting upon an object, the greater the acceleration of the object.
8. The force ~r exerts on a moving object is
. (2 words)
9. Weight is a measure of the force of __ .
10. Any change in an object's position is __ .
11. In the equation F = m x a, F stands for __ .
tz. The highest velocity reached by a falling object is its __ velocity.
Fill in the blank below with the term in the black box.
Force equals
18
times mass.
Copyright ~ Glencoe/McGraw-Hili, a division of The McGraw-Hili Companies, Inc.
NAME
CLASS
DATE
*. Action and Reaction
Choose the term from the list below that is best described by each statement. Write the term to the left of each
statement.
Newton's second law of motion
conservation of momentum
Newton's third law of motion
mass
action
reaction
momentum
velocity
1. When one object exerts a force on a second object, the
second object exerts a force that is equal in size and
opposite in direction.
2. The backward "kick" of a rifle that is fired is an example
of a(n) __ force.
3. The total amount of momentum of a group of objects
does not change unless outside forces act on the objects.
4. A net force acting on an object causes the object to accelerate in the direction of the force.
5. Air rushing out of the neck of a balloon causes the balloon to move. The air that comes from the balloon is an
example of a(n) __ force.
6. In the equation p = m x
V,
p represents __
7. Momentum has direction because
.
has direction.
8. Momentum is a property a moving object has because of
its __ and velocity.
Think for a minute about Newton's third law of motion. Can you remember any event when you experienced this law?
If so, draw a diagram below to show the action-reaction forces. If you can't remember an event that you experienced,
try to think up one and draw it below .
•
NAME
•
DATE
CLASS
" Projectile and
Circular Motion
Determine whether the italicized term makes each statement true orfalse. If the statement is true, write the word
"true" in the blank. If the statement is false, write in the blank the term that makes the statement true.
1. Anything that is thrown or shot through the air is called a projectile.
2. Because of Earth's gravitational pull and their own inertia, projectiles
travel in a straight pa,th.
3. Motion parallel to Earth's surface is vertical motion.
4. Motion perpendicular to Earth's surface is vertical motion.
5. Objects fall toward Earth at a rate of 9.8 m/s2 because of centripetal
force.
6. Acceleration is a change in motion.
7. The word centripetal means "toward the outside."
8. Acceleration toward the center of a curved or circular path is called
gravitational acceleration.
9. Centripetal force is a force that causes a moving object to move in a
curved or circular path.
________
10. An orbiting space shuttle and its contents are in [reefal! around Earthi
11. A change in the speed or direction of an object is called inertia.
Answer the following question with complete sentences.
12. Why do objects that are thrown or shot follow a curved path?
13. Draw a diagram below to illustrate your answer for question 12.
•
,
_
NAME
DATE
...'. Sending Up Satellite~
_.'-..
Determine whether the italicized term makes each statement true or false. If the statement is true, write the word
"true" in the space provided. If the statement is false, write In the blank the term that makes the statement true.
1. Artificial satellites are human-made devices that orbit
Earth for specific purposes.
2. Earth's moon is an artificial satellite.
3. Isaac Newton originated the idea of launching a satellite
by blasting it vertically from a mountain top.
4. Most modern satellites are lifted to their desired orbiting
heights by multistage rocket systems.
5. The speed necessary for a satellite to stay in a circular
orbit is about 8 km/ s, or about 29 000 km/hr.
6. The former Soviet Union launched the first artificial
Earth satellite in 1980.
7. Most communication and weather satellites are geostationary satellites.
8. Geostationary satellites appear to be moving high above
a given location because they are placed in orbit with a
speed that matches the movement of Earth as it spins on
its axis.
9. Many satellites are used by the military to monitor
actions in other countries because they can photograph
tiny details.
10. Air resistance gradually causes most orbiting satellites to
lose energy allowing the Earth's rotation to pull them
lower.
11. As a satellite moves through the denser part of Earth's
atmosphere, it usually burns up in the extreme heat generated by atmospheric friction.
""',)J
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)
20
Copyright
0 Glencoe/MCGraw-Hili,
a division of The McGraw-Hili
Companies, Inc.
NAME
C'--:,~,~
".....
"::.
DATE
l'
CLASS
Acceleration and Momentum
Part A. Vocabulary Review
In the space at the left, write the term from the word list that correctly completes each statement.
Newton's second law of motion
terminal velocity
projectile
air resistance
Newton's third law of motion
centripetal acceleration
momentum
centripetal force
conservation of momentum
isometric exercises
1. The phrase lito every action there is an equal and opposite
reaction" is __
2. The largest velocity reached by a falling object is its __
.
3. A ball thrown across a football field is an example of a(n)
4. When an object moves in a circle, __
acts to accelerate
the object toward the center of that circle.
5. When a car travels around a curve in the road, __
to keep the car traveling in a curved path.
helps
6. The force exerted by air on a moving object is called __
7. A net force acting on an object causes the object to accelerate in the direction of the force; this is __ .
£h.-:,'"
-~
8. A property of a moving object resulting from its mass and
velocity is __ .
9. According to the
when a bowling ball strikes the
pins, the momentum lost by the bowling ball is equal to
the momentum gained by the pins.
.
-J
____________
10. Muscles pushing against muscles is the goal of __
.
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DATE
NAME
CLASS
Chapter 4 Review (continued)
PartB.ConceptRe~ew
1.
In the diagram below, a satellite is shown orbiting Earth. Add three arrows to the diagram to
indicate the effects of a. inertia, b. gravity, and c. the path you predict results from the effects
of inertia and gravity. Label the arrows a, b, and c.
o
Satellite
Orbit path
2.
Complete the diagrams below by indicating the path of the ball in each situation.
---------~
a. The ball is placed on the edge of a table and allowed to fall to the floor.
b. The ball is rolled rapidly across the table and falls onto the floor.
3.
The balls in the figure above have the same mass. I( the balls are dropped from the table at
the same time, which ball will hit the floor first?
4.
If a 2-kg ball is thrown through the air at 20 m/s, what is the momentum of the ball?
5.
Why would a flat sheet of paper and a wad of paper with the same mass not fall through the
air at the same rate?
6.
When is something weightless?
7.
Why might exposing astronauts to weightlessness be harmful?
8.
What are two ways that astronauts on the space shuttle combat the effects of weightlessness?
12
Copyright
(:) Glencoe/McGraw-Hili,
a division of The McGraw-Hili
Companies, Inc.
,.,~