Multiple Choice 1.) Which answer best represents the system\'s change in energy
ID: 1352279 • Letter: M
Question
Multiple Choice
1.) Which answer best represents the system's change in energy for the following process? The system includes Earth, two carts, and a compressed spring between the carts. The spring is released, and in the final state, one cart is moving up a frictionless ramp until it stops. The other cart is moving inthe opposite direction on a horizontal frictionless track.
(a) Kinetic energy to gravitational potential energy
(b) Elastic potential energy to gravitational potential energy
(c) Elastic potential energy to kinetic energy and gravitational potential energy
2.) Three processes are described below. Choose one process in which there is work done on the system. The spring, Earth, and the cart are part of the system.
(a) A relaxed spring rests upright on a tabletop. You slowly compress the spring. You then release the spring and it flies up several meters to its highest point.
(b) A cart at the top of a smooth inclined surface coasts at increasing speed to the bottom (ignore friction).
(c) A cart at the top of a smooth inclined surface slides at increasing speed to the bottom where it runs into and compresses a spring (ignore friction).
3.) Which example(s) below involve zero physics work? Choose all that apply.
(a) A person holds a child.
(b) A person pushes a car stuck in the snow but the car does not move.
(c) A rope supports a swinging chandelier.
(d) A person uses a self-propelled lawn mower on a level lawn.
(e) A person pulls a sled uphill.
Explanation / Answer
1) (c) Elastic potential energy to kinetic energy and gravitational potential energy
2)
(a) A relaxed spring rests upright on a tabletop. You slowly compress the spring. You then release the spring and it flies up several meters to its highest point
(c) A cart at the top of a smooth inclined surface slides at increasing speed to the bottom where it runs into and compresses a spring (ignore friction)
3)
(a) A person holds a child.
(b) A person pushes a car stuck in the snow but the car does not move.
(c) A rope supports a swinging chandelier
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