Name: 
 

8th Grade Movement Review



Completion
Complete each statement.
 

 1. 

the tendency of an object to resist change in its motion ____________________
 

 

 2. 

the rate of change of velocity ____________________
 

 

 3. 

the distance traveled divided by the time it takes to travel that specific distance ____________________
 

 

 4. 

a measure of how hard it is to stop an object ____________________
 

 

 5. 

speed plus direction ____________________
 

 

 6. 

the amount of matter in an object ____________________
 

 

 7. 

speed of an object at one instant of time ____________________
 

 
 
Choose the best of the three choices in parentheses.
 

 8. 

The momentum of a falling leaf is ____________________ (greater than, less than, equal to) the momentum of a falling pinecone.
 

 

 9. 

Two objects each have a mass of 70 kg. Their momentum is ____________________ (equal, changing, unknown).
 

 

 10. 

When two pool balls collide and move away from each other, they eventually stop. This is because of ____________________ (momentum, friction, inertia).
 

 

 11. 

A 50 kg object moves with a velocity of 10 m/s. Its momentum is ____________________ (500 m/s2, 5 kg m/s, 500 kg m/s).
 

 

Short Answer
 

 12. 

The velocity of an object goes from 4 m/s to 12 m/s in 4 s. What is its acceleration?
 

 13. 

A 600 g toy car moving at 3 m/s collides and hooks up with a 900 g toy car at rest and they move off together. What is their final velocity?
 
 
Use each of the listed terms in a complete sentence.
 

 14. 

speed
 

 15. 

average speed
 

 16. 

velocity
 

 17. 

acceleration
 

 18. 

negative acceleration
 

 19. 

mass
 

 20. 

inertia
 

 21. 

momentum
 

 22. 

displacement
 

 23. 

law of conservation of momentum
 

 24. 

When objects collide, the total initial momentum equals the total final momentum.
 

Matching
 
 
Match the terms with the correct phrase below.
a.
kg m/s
d.
m/s
b.
m/s2
e.
m
c.
kg
 

 25. 

distance
 

 26. 

speed
 

 27. 

acceleration
 

 28. 

momentum
 

 29. 

mass
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 30. 

Two km south is a measure of ____.
a.
distance
c.
velocity
b.
displacement
d.
acceleration
 

 31. 

A 10-kg object has a momentum of 50 kg m/s. Its velocity is ____.
a.
10 m/s
c.
5 m/s
b.
5 m/s2
d.
500 m/s
 

 32. 

An object’s inertia depends on its ____.
a.
mass
c.
momentum
b.
weight
d.
gravity
 

 33. 

Momentum depends on ____ and ____.
a.
mass, weight
c.
velocity, weight
b.
weight, inertia
d.
mass, velocity
 

 34. 

The hands of a clock ____.
a.
have a constant velocity
c.
constantly change speed
b.
have no momentum
d.
are accelerating
 

Essay
 

 35. 

If an object moves at constant speed, can we assume that is not accelerating? Explain.
 

 36. 

A car travels 10 km north, 5 km east, 15 km south, then 5 km north.
a.What is the distance it travels?
b.What is its displacement?
 

 37. 

An object’s velocity changes from 30 m/s to 23 m/s in 3 s. What is its acceleration?
 

 38. 

A 5-kg object moving at 20 m/s collides with a 10-kg object moving a 5 m/s. They stick together and move off together. What is their final velocity?
 

 39. 

You flew in an airplane from Denver to San Francisco, and your friend rode in a car for the same trip. For which one of you would the displacement most nearly equal the distance? Explain.
 

 40. 

You hear on a weather report that a tornado in a town near you is moving at 25 km/h. Is this enough information to know whether or not you are in danger? Explain.
 

 41. 

What is momentum and how does it differ from inertia?
 

 42. 

A tennis ball and a bowling ball have the same velocity. Which would be harder to stop? Explain.
 

 43. 

How do you explain conservation of momentum when a rocket ship takes off?
 



 
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