1.
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A puck resting on ice is attached to a string and given an initial tangential push so that it rotates as shown in the animation. If the string suddenly breaks at t=2.5 seconds, what direction will the puck move?
Start
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| In the direction of the purple arrow. |
| In the direction of the orange arrow. |
| In the direction of the red arrow. |
| In the direction of the green arrow. |
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2.
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A puck moving on an air hockey table at constant speed receives a momentary "push" in the +y direction at x=0 as shown in each of the animations below. Which animation correctly shows the motion of the puck after it is pushed?
Start animation 1
Start animation 2
Start animation 3
Start animation 4
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| Animation 1 |
| Animation 2 |
| Animation 3 |
| Animation 4 |
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3.
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A satellite floats at constant speed when, at t=2, its thrusters are suddenly engaged producing a constant force perpendicular to its original motion. Which animation correctly depicts the satellite's motion after the thrusters are first engaged?
Start animation 1
Start animation 2
Start animation 3
Start animation 4
Interactive Hint: Green arrow represents the y-velocity and the blue arrow represents the x-velocity.
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| Animation 1 |
| Animation 2 |
| Animation 3 |
| Animation 4 |
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4.
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A 1700 kg car slows to a stop as shown in the animation (position is in meters and time is in seconds). What is the average net force on the car?
Start Interactive Hint
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| zero |
| -8,500 N |
| -16,660 N |
| -17,000 N |
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5.
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Two carts rest on similar air tracks. Each is given an identical push for 1 second. Which cart is more massive? Start
Interactive Hint: The blue arrow represents acceleration.
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| Green cart |
| Orange cart |
| Neither - the carts have the same mass. |
| Not enough information. |
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6.
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A 4500 kg truck breaks down and receives a push of constant force by a 1500 kg car as shown in the animation (position is in meters and time is in seconds)? What is the force of the car on the truck? Start
Interactive Hint: The blue arrow represents acceleration.
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| 20,400 N |
| 5100 |
| 15,300 N |
| 4500 N |
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7.
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An elevator accelerates upward for one second, travels at constant velocity, and then decelerates one second prior to reaching its destination such that it comes to rest. If a 50 kg woman stands on a scale in the elevator, what will the scale read when t is between 0 and 1 second? Start
Interactive Hint
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| 590 N |
| 490 N |
| 390 N |
| 50 N |
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8.
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A 10,000 kg draw bridge is lifted by two identical counterweights as shown (neglect friction and the mass of the pulleys in this model). What is the mass of each counterweight? Start
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| 5,000 kg |
| 6807 kg |
| 10,000 kg |
| 3403 |
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9.
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A 10 kg box slides down a rough incline as shown in the animation (position is in meters and time is in seconds). What is the magnitude of the force of friction on the box? Start
Interactive Hint
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| 70 N |
| 17 N |
| 26 N |
| 44 N |
