Name:    8th Grade Review Game for Movement

Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.

1.

Motion is a change in direction. _________________________

2.

If you are driving up a curvy mountain road, your displacement would be greater than your distance. _________________________

3.

If you travel through a city and find that you travel 5 km in 30 minutes, you could say that your constant speed is 6 km/h. _________________________

4.

A line on a speed-time graph with a steep slope indicates a greater speed. _________________________

5.

When you run around a track at 5 km/h, your velocity is constant. _________________________

6.

To find acceleration, subtract the final velocity from the initial velocity and divide by the time. ________________________________________

7.

The slope of the line on a speed-time graph tells the speed. _________________________

8.

A falling leaf has less momentum than a pile of leaves on the ground. _________________________

9.

As a moving object's velocity decreases, its momentum decreases. _________________________

10.

The longer a force acts on moving object, the greater its change in momentum. _________________________

11.

The momentum before a collision of three objects is always greater than the momentum after the collision. _________________________

12.

If two objects collide they each have the same momentum as they had before the collision. ______________________________

13.

A 10-kg object moving at 20 m/s collides with a 10-kg object that is stationary. After the collision, the velocity of the second object is 20 m/s. _________________________

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

14.

Speed is the rate of change in ____.
 a. velocity c. direction b. time d. distance

15.

To describe velocity you need to know ____.
 a. speed and direction c. direction and acceleration b. speed and time d. speed and acceleration

16.

When you graph the motion of an object, you put ____ on the horizontal axis and ____ on the vertical axis.
 a. speed, time c. time, speed b. distance, time d. time, distance

17.

Acceleration involves a change in ____.
 a. time c. speed b. direction d. both b and c

18.

Acceleration is a change in ____.
 a. speed c. displacement b. velocity d. position

19.

On a speed-time graph, a horizontal line shows the change in speed is ____.
 a. –10 c. 1 b. 10 d. 0

20.

Inertia ____.
 a. depends on direction c. resists a change in motion of an object b. depends on momentum d. both a and b

21.

If you exert a force on an object in motion you will change its ____.
 a. mass c. inertia b. weight d. momentum

22.

The distance traveled divided by the time taken to travel the distance is ____.
 a. average speed c. momentum b. mass d. speed

23.

When object A collides with object B and bounces back, its final momentum is ____ its initial momentum.
 a. greater than c. in the same direction as b. less than d. in the opposite direction of

24.

When a toy truck collides into a toy car, the momentum of ____ is the same before and after the collision.
 a. the truck c. the truck times the car b. the car d. the truck plus the car

25.

Momentum is a measure of ____.
 a. how hard it is to stop an object b. the amount of matter in an object c. the tendency of an object to change its motion d. the amount of force acting on an object

Completion
Complete each statement.

26.

27.

A distance-time graph shows a horizontal line. This means that the velocity is ____________________.

28.

If your speed changes from 10 km/h to 6 km/h, you have a(n) ____________________ acceleration.

29.

Three ways to accelerate an object are to ____________________, ____________________, or ____________________.

30.

If a ball is rolling in a straight line and you push it to the right, its velocity will ____________________ to the right.

31.

To have momentum, an object must be ____________________.

32.

If an object is moving at a constant velocity and you want to change its momentum, you would change its ____________________.

33.

Momentum has the same direction as ____________________.

34.

When an object with a momentum of 80 kg ´ m/s collides with an object with a momentum of –100 kg ´ m/s the total momentum after the collision is ____________________ kg ´ m/s.

35.

The tendency of an object to resist a change in motion is called ____________________.

36.

You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same velocity? Explain.

37.

If someone is walking on a moving bus, name two reasonable reference points you might use to describe his or her motion.

38.

What is the difference between distance and displacement?

39.

If you ride your bike around the block, returning to the exact point where you started, what is your displacement?

40.

Describe your motion in terms of velocity and acceleration as you ride down the street, come to a red light, wait for the green light and then start off again.

41.

Describe the motion of a car with an acceleration of –2 m/s2.

42.

Is the momentum of a car traveling south the same as the momentum of a similar car traveling north at the same speed? Explain.

43.

A truck and a bicycle have the same momentum. Which would be harder to stop? Explain.

44.

When three balls collide, they bounce off of each other and roll away, but eventually they stop. Does this violate the law of conservation of momentum? Explain.

Problem

45.

You travel 190 km in 2 h. What is your speed in km/h?

46.

A car goes from 80 km/h to 20 km/h in 0.5 h. What is the acceleration in km/h2?"

47.

A compact car with a mass of 725 kg is moving at 30 m/s. What is its momentum?

48.

A 50-kg object has a momentum of 600 kg x m/s. What is its velocity?

49.

A 50-kg object moving at 12 m/s has a momentum of 600 kg ´ g m/s. What is the mass of an object, moving at 4 m/s that has the same momentum?

50.

A 25-kg object moving at 15 m/s collides with a 15-kg object that is standing still. They stick together and keep moving. What is the final velocity?

51.

A 0.4-kg toy train car moving forward at 3 m/s collides with and sticks to a 0.8–kg toy car that is traveling in the opposite direction at –2 m/s. What is the size and direction of the final velocity of the two cars?