Modified True/False
Indicate
whether the statement is true or false. If false, change the identified word or phrase to make the
statement true.
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1.
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Motion is a change in direction. _________________________
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2.
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If you are driving up a curvy mountain road, your displacement would be
greater than your distance. _________________________
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3.
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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. _________________________
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4.
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A line on a speed-time graph with a steep slope indicates a greater
speed. _________________________
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5.
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When you run around a track at 5 km/h, your velocity is constant.
_________________________
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6.
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To find acceleration, subtract the final velocity from the initial
velocity and divide by the time. ________________________________________
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7.
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The slope of the line on a speed-time graph tells the speed.
_________________________
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8.
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A falling leaf has less momentum than a pile of leaves on the ground.
_________________________
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9.
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As a moving object's velocity decreases, its momentum decreases.
_________________________
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10.
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The longer a force acts on moving object, the greater its change in
momentum. _________________________
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11.
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The momentum before a collision of three objects is always greater than
the momentum after the collision. _________________________
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12.
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If two objects collide they each have the same momentum as they had
before the collision. ______________________________
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13.
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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.
_________________________
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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14.
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Speed is the rate of change in ____.
a. | velocity | c. | direction | b. | time | d. | distance |
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15.
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To describe velocity you need to know ____.
a. | speed and direction | c. | direction and acceleration | b. | speed and
time | d. | speed and
acceleration |
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16.
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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 |
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17.
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Acceleration involves a change in ____.
a. | time | c. | speed | b. | direction | d. | both b and c |
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18.
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Acceleration is a change in ____.
a. | speed | c. | displacement | b. | velocity | d. | position |
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19.
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On a speed-time graph, a horizontal line shows the change in speed is
____.
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20.
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Inertia ____.
a. | depends on direction | c. | resists a change in motion of an object | b. | depends on
momentum | d. | both a and
b |
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21.
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If you exert a force on an object in motion you will change its ____.
a. | mass | c. | inertia | b. | weight | d. | momentum |
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22.
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The distance traveled divided by the time taken to travel the distance is
____.
a. | average speed | c. | momentum | b. | mass | d. | speed |
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23.
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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 |
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24.
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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 |
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25.
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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 |
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Completion
Complete each
statement.
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26.
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The speed you read from your speedometer is your ____________________.
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27.
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A distance-time graph shows a horizontal line. This means that the velocity is
____________________.
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28.
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If your speed changes from 10 km/h to 6 km/h, you have a(n) ____________________
acceleration.
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29.
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Three ways to accelerate an object are to ____________________,
____________________, or ____________________.
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30.
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If a ball is rolling in a straight line and you push it to the right, its
velocity will ____________________ to the right.
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31.
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To have momentum, an object must be ____________________.
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32.
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If an object is moving at a constant velocity and you want to change its
momentum, you would change its ____________________.
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33.
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Momentum has the same direction as ____________________.
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34.
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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.
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35.
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The tendency of an object to resist a change in motion is called
____________________.
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Short Answer
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36.
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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.
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37.
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If someone is walking on a moving bus, name two reasonable reference points you
might use to describe his or her motion.
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38.
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What is the difference between distance and displacement?
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39.
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If you ride your bike around the block, returning to the exact point where you
started, what is your displacement?
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40.
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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.
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41.
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Describe the motion of a car with an acceleration of –2
m/s2.
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42.
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Is the momentum of a car traveling south the same as the momentum of a similar
car traveling north at the same speed? Explain.
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43.
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A truck and a bicycle have the same momentum. Which would be harder to stop?
Explain.
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44.
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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.
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Problem
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45.
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You travel 190 km in 2 h. What is your speed in km/h?
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46.
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A car goes from 80 km/h to 20 km/h in 0.5 h. What is the acceleration in
km/h2?"
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47.
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A compact car with a mass of 725 kg is moving at 30 m/s. What is its
momentum?
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48.
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A 50-kg object has a momentum of 600 kg x m/s. What is its velocity?
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49.
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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?
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50.
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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?
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51.
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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?
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