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- 1. Multiple Choice
Why does an object in motion stay in motion unless acted on by an unbalanced force?
because forces are what stop and start motion
because balanced forces can not exist in nature
because motion is the inherent state of all matter
because motion, once begun, continues to accelerate
- 2. Multiple Choice
A train rolls to a stop along a horizontal track without the conductor applying the brakes. What answer choice BEST explains why this occurred?
The train ran out of momentum.
The opposing force of friction stopped the train.
The natural state of the train is not to be in motion.
The force of gravity slowed the train until it stopped.
- 3. Multiple Choice
This graph represents the motion of a car while driving over a short distance. Which statement accurately describes the motion of the car in this graph?
It is going forwards slow, then it is going forwards fast.
It is going forwards fast, then it is going forwards slowly.
It is going backwards slow, then it is going backwards fast.
It is going backwards fast, then it is going backwards slowly.
- 4. Multiple Choice
John and Caroline go out for a walk one day. This graph represents the distance they traveled over time.
During what part of their walk are they not moving?
From 0 to 0.75 hours
From 1.25 to 2.0 hours
From 0.75 to 1.25 hours
They are moving the entire time.
- 5. Multiple Choice
A train engineer started the train from a standstill and sped up to 5 meters per second, she then rounded a corner at a constant speed. She then sped the train up to 10 meters per second on the next straightaway. Next, the train chugged around another bend at 10 m/sec, and then its speed slowed to 5 meters per second after coming out of the bend. Finally, the train reached the station, and the engineer applied the brakes and brought the engine to a stop. How many times did the train accelerate?
2
4
5
6
- 6. Multiple Choice
Imagine you are on the top of a mountain with four basketballs. The mass of the four basketballs are 100 kilograms, 200 kilograms, 300 kilograms, and 400 kilograms. If the basketballs rolled down the hill, which one would supply the greatest force at the bottom of the mountain (assume that their velocities were equal at the bottom of the mountain)?
100 kilogram basketball
200 kilogram basketball
300 kilogram basketball
400 kilogram basketball
- 7. Multiple Choice
At the county fair, Carrie and Sam climbed up on the carousel horses. Around and around they went; the horses also bobbed up and down. When they got off of the carousel, Carrie told Sam they had been accelerating during their ride. Sam disagreed; they had been moving at a constant speed. Whose response is fully correct, and why?
Carrie is, because the carousel changed speed when it started and stopped.
Sam is, because the horses never moved from their position on the carousel.
Carrie is, because velocity includes speed plus direction, and both changed.
Sam is, they did not accelerate since their speed remained constant for the ride.
- 8. Multiple Choice
The Smith family is traveling in their car at 50 km/h due east. Mr. Smith is using cruise control to maintain a constant speed. Describe the net force acting on the Smith car.
Net force equals zero.
Net forces are unbalanced.
Net force is positive and to the east.
There is no way to determine net force.
- 9. Multiple Choice
Consider the free body diagram. If the sum of the tension forces is equal to the force of gravity, which description BEST applies?
A book is at rest on a tabletop.
A physics student rests a backpack upon one shoulder.
A girl hangs by both hands, motionless, from a pull up bar.
A girl falls slowly to Earth while strapped to a parachute.
- 10. Multiple Choice
Consider this line graph that represents speed in meters/second. The X-axis is labelled in seconds; the Y-axis is labelled in meters. Imagine that the moving object stops after 2.5 seconds and stays stopped for 0.5 seconds. What would the line for that time interval look like on this graph?
curve downward to Y equals 3
straight, diagonal, negative slope to {14, 3}
straight, diagonal, positive slope to {3, 15}
straight and horizontal at Y equals 14, to {3, 14}
- 11. Multiple Choice
Consider these four line graphs representing speed in meters/second, where each X-axis is labelled in seconds and each Y-axis is labelled in meters.
What do the four graphs have in common?
They all indicate a constant speed.
They all indicate an increase in speed.
All four graphs have nothing in common.
They all represent the same speed in m/s.
- 12. Multiple Choice
Bill and Tom are both towing wagons. Bill's wagon weighs 10 pounds, and Tom's wagon weighs 20 pounds. Bill is pulling his wagon with twice the force that Tom is. How do the wagon speeds compare?
Both wagons will be moving at the same speed.
Bill's wagon is moving 4 times faster than Tom's.
Tom's wagon is moving 4 times faster than Bill's.
Bill's wagon is moving 2 times faster than Tom's.
- 13. Multiple Choice
The image shows two opposite forces acting on a rolling cart, what can we say is true about the affect of the forces on the cart?
It cannot be determined without knowing which man is stronger.
The forces are not balanced, because one man is taller than the other.
The forces are balanced. But, the forces acting on the cart have increased and the cart’s motion is affected.
The forces are balanced. Thus, there is no change in forces acting on the cart and the cart’s motion is not affected.
- 14. Multiple Choice
Consider the data collected in science class. Different masses were thrown with varied amounts of force. The data table reflects Newton's 2nd Law of Motion, or F = ma. Based on the data collected, what can we say about the objects acceleration?
In all cases, the acceleration was the same.
The acceleration decreased as the mass increased.
The acceleration increased as the force increased.
The greater the force, the greater the acceleration.
- 15. Multiple Choice
Consider the car driving around a circular track. Once started, the driver maintains a speed of 45 m/h. Compare the driver's velocity with his acceleration in this case.
The car is accelerating because it is changing direction but the velocity is constant.
The car is traveling at a constant rate of speed so it is not accelerating and the velocity does not change.
Acceleration is the change in velocity so the car is experiencing a change in velocity and it is accelerating.
The car is traveling at a constant rate of speed so it is not accelerating but the velocity changes because the direction the car travels is constantly changing.
- 16. Multiple Choice
Consider the motion diagram. It illustrates a car's velocity (V) and acceleration (A). Is there a change in either velocity or acceleration? Is there a change in both? Explain.
The velocity is changing because the car is slowing down. The car is not accelerating; it would be decelerating.
Neither one changes. The velocity remains constant because the car is not changing direction. It is coming to a stop so it is decelerating.
The velocity remains constant because the car is not changing direction. The car is slowing down so it is experiencing negative acceleration.
Both the velocity and the acceleration change. The car is slowing down = change in velocity. Slowing down would also indicate negative acceleration.
- 17. Multiple Choice
An equal force is used to push several blocks of different sizes across a table. The time it takes for the block to move across the table is recorded and a graph of the data is made. What can you conclude from the data?
Larger boxes travel slower because they take less time to cross the table.
Smaller boxes travel slower because they take less time to cross the table.
Larger boxes travel slower because they take longer to cross the table.
Larger boxes travel faster because they take longer to cross the table.
- 18. Multiple Choice
Using two spring scales, students pull on opposite sides of a dynamic cart at rest. 5 Newtons of force is pulling left and 5 newtons force is pulling right. Describe the motion of the cart?
The cart will move to the right.
The cart will move to the left.
The cart will not move.
The cart will move up.
- 19. Multiple Choice
A dog named Rascal leaves his home and travels a short distance and then returns home. The graph shows his position as a function of time.
How does his velocity on his return trip compare to his velocity for the first 5 seconds?
His velocity was slower when compared to the first 5 seconds.
His velocity was positive on the return trip when compared to the first 5 seconds.
His velocity on the return trip was twice as slow when compared to the first 5 seconds.
His velocity on the return trip was twice as fast when compared to the first 5 seconds.
- 20. Multiple Choice
A car's position in relation to time is plotted on the graph. What can be said about the car during segment B?
The car travels for 80 seconds during segment B.
The car has come to a stop and has zero velocity.
The car is traveling faster during segment B than in segment C.
The car is traveling with a constant velocity due to the flat line of the graph.
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