Terms : Hide Images
| 16311754921 | A dog is standing in the bed of a pickup truck. The bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog | Does not move left or right, but the back of the truck moves toward the dog. | 0 | |
| 16311762094 | A puck attached to a string undergoes circular motion on an air table. If the string breaks at the point indicated in the figure, is the subsequent motion of the puck best described by path A, B, C, or D? | B |  | 1 |
| 16311795335 | During the snow storm, you saw a girl standing still holding her sled, which was initially at rest. She then accelerated forward, pulling her sled along with her until she and the sled reached a constant speed. Which of the following statements about the magnitude of the forces between the sled and the girl are true during this process? | The girl's pull on the sled was always equal to the sled's pull on the girl. | 2 | |
| 16311807946 | Assuming the positive direction points North, which of these situations results in a positive velocity and a negative acceleration? | A plane flying North and slowing down. | 3 | |
| 16311819563 | A ball is thrown and follows the parabolic path shown. Point Q is the highest point on the path and points P and R are the same height above the ground. How do the magnitudes of the velocity of the ball at the three points compare? Air resistance is negligible. | │vQ │ < │vP │= │vR │ | 4 | |
| 16311825635 | A ball is thrown and follows the parabolic path shown. Point Q is the highest point on the path and points P and R are the same height above the ground. How do the magnitudes of the acceleration of the ball at the three points compare? Air resistance is negligible. | │aP │ = │aQ │= │aR │ | 5 | |
| 16311841565 | The figure depicts the trajectory of a cannonball undergoing projectile motion as it is shot from the top of a hill. If air resistance can be neglected, which of the following is false? The x-component of the velocity is constant throughout the motion. The y-component of the velocity is zero at the top of the trajectory. The speed of the cannonball reaches its maximum value at the time of its launch. The speed of the cannonball reaches its maximum value just before it lands. The acceleration of the cannonball is constant throughout its motion. All of the above statements are true. Two or more of the statements a) - e) are false | The speed of the cannonball reaches its maximum value at the time of its launch. | 6 | |
| 16311882868 | Jan and Len throw identical rocks off a tall building at the same time. The ground near the building is flat. Jan throws her rock straight downward. Len throws his rock downward and outward such that the angle between the initial velocity of the rock and the horizon is 30°. Len throws the rock with a speed twice that of Jan's rock. If air resistance is negligible, which rock hits the ground first? | They hit at the same time. | 7 | |
| 16311896555 | A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will | be over the package. | 8 | |
| 16311926675 | You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you. You can either catch the object or deflect the object back towards your friend. What should you do in order to MINIMIZE your speed on the skateboard? | catch the ball | 9 | |
| 16311936252 | You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under identical conditions? | It would have skidded 4 times farther. | 10 | |
| 16311959561 | An insurance company is testing air bag safety. Car A has front air bags and Car B does not. In both cases, the cars are driven into a brick wall with the same momentum. In Car A, the dummy survives, but in Car B, the dummy does not. In terms of impulse and force, please explain this result. | The dummy in Car B experienced the same impulse but a greater force than in Car A. | 11 | |
| 16311971817 | In a collision between two objects having unequal masses, how does the magnitude of the impulse imparted to the lighter object by the heavier one compare with the magnitude of the impulse imparted to the heavier object by the lighter one? | both objects receive the same impulse | 12 | |
| 16311986324 | Three identical rocks are thrown from the top of a building. Rock #1 is thrown horizontally with a speed of 12 m/s. Rock #2 is thrown straight upward with a speed of 12 m/s. Rock #3 is thrown straight downward with a speed of 12 m/s. There is no air resistance and none of the rocks come into contact with anything before they hit the ground at the base of the building. Compare the rocks' speeds just before they strike the ground at the base of the building by ranking them from fastest to slowest. | all three rocks have the same final speed | 13 | |
| 16312003012 | You stand at the top of a cliff and lower a first aid kit (attached to a rope) down the cliff to an injured hiker at a constant speed. What can you say about the work done by the rope and the work done by gravity on the kit as it is lowered? | The work done by the rope is negative and the work done by gravity is positive. | 14 |
