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1st quarter Review
I. Testing Concepts
Directions: For each of the following, write the letter of the term or phrase that best completes each statement
or answers each question.
1. The upward force exerted on an object falling through air is
.
a. terminal velocity
c. air resistance
b. momentum
d. weightless
2. The statement “to every action there is an equal and opposite reaction” is .
a. the law of conservation of momentum c. Newton’s second law of motion
b. Newton’s first law of motion
d. Newton’s third law of motion
3. The product of mass and acceleration gives a quantity known as
.
a. momentum
b. friction
c. inertia
d. force
4. An object that is in free fall that reaches terminal velocity is _
.
a. moving at a constant velocity
c. sped up by air resistance
b. slowed by air resistance
d. not moving
5. The relationship among mass, force, and acceleration is explained by
.
a. Newton’s first law of motion
c. Newton’s third law of motion
b. Newton’s second law of motion
d. the conservation of momentum
6. When two objects collide, the reaction force is __________.
a. equal to the action force in the same c. equal to the action force in the opposite
direction
direction.
b. unequal to the action force in the same d. unequal to the action force in the
direction
opposite direction.
7. A feather will fall through the air more slowly than a brick because of
.
a. gravity
b. air resistance
c. terminal velocity d. momentum
8. In the absence of air, a penny and a feather dropped from the same height will
.
a. fall at different rates
c. fall at the same rates
b. float
d. not have momentum
9. Sara pushes against the wall. The action force is her pushing the wall. What’s the reaction
force.
a. friction between her hand and the wall c. Sara pets her dog.
b. Sara pushing the wall.
d. the wall pushing on Sara
10. An object at terminal velocity has an acceleration of
a. zero
b. one
c. 9.8 m/s2
.
d. 98 m/s2
11. If a 300-N action force is exerted to the right, the reaction force will be
a. 300 N to the right
c. 300 N to the left
b. 600 N to the right
d. 600 N to the left
.
12. When a force is exerted on an object, an equal and opposite force is exerted by the
object. These forces are referred to as
.
a. centripetal forces
c. gravitational forces
b. friction forces
d. action-reaction forces
13. Acceleration due to gravity is
a. 98 m/s2
b. 9.8 m/s2
.
c. 9.8 m/s
d. 0.98 m/s
14. An object attached to a string that is being swung in a clockwise circular path is
shown. Assume the string breaks at point A. In which direction will the object be
traveling an instant later?
15. According to Newton’s second law of motion,
.
a. F = mv
b. F = ma
c. F = pv
d. F = pa
16. Friction is a force that __________, or goes against, motion.
a. accelerates
b. opposes
c. forces
d. riding
17. If you double the force on an object, it’s acceleration ________.
a. stays the same
b. doubles
c. triples
d. is halved.
II. Applying Concepts
Directions: Do the following calculations. Show your work in the spaces provided.
1. What is the force of an object with a mass of 12 kg and an acceleration of 4 m/s2?
2. Calculate the acceleration of a 25-kg object that is moved with a force of 300 N.
3. What is the mass of an object that is accelerating at 15 m/s2 when a force of 3000 N is exerted?
4. What is the speed of an object that travels 10 m in 2 seconds?
III. Writing Skills
Directions: Answer the following questions using complete sentences.
1. Two objects that have the same mass are dropped from the top of a 20-m high building. One
object is larger and flatter than the other object. Explain why the larger, flatter object hits the
ground last.
2. Why do you fall forward when the driver slams on the brakes in a car?
3. How is mass different from weight?