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Work and Energy

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Work and Energy Answer Key

Which of the following is NOT an example of kinetic energy being converted to potential energy?
  1. a basketball player jumping for a rebound
  2. releasing a compressed spring
  3. squeezing a rubber ball
  4. pulling a sled up a hill
Which one is doing the most work?
  1. pulling a box 10 m with a force of 100 N
  2. pushing a box 100 m with a force of 200N
  3. pulling a sled 1000 m with a force of 10N
  4. pushing a car with a force of 100000 N and it doesn't move
A 100-kg rock is 100 m above the ground, what is the potential energy of the rock?
  1. 100000 J
  2. 86000 J
  3. 45382 J
  4. 98000 J
An example of potential energy is
  1. a basketball sitting on a rack.
  2. a bird flying.
  3. Grandma rocking in her chair.
  4. none of the above.
A car or truck moving down the highway has                 energy by virtue of its motion.
  1. kinetic
  2. potential
  3. thermodynamic
  4. chemical
Ethan carried a 200 Newton bag 3 meters up a ladder in 30 seconds. How much power did he use?
  1. 2000 Watts
  2. 18000 Watts
  3. 20 Watts
  4. 0 Watts
Which situation is an example of increasing potential energy?
  1. a bicyclist stopping at a stop sign
  2. a cat jumping from a tree
  3. emptying a bucket of water
  4. pulling a wagon uphill
An arrow in a bow has 70 J of potential energy. Assuming no loss of energy due to heat, how much kinetic energy will it have after it has been shot?
  1. 140 J
  2. 70 J
  3. 50 J
  4. 35 J
Imagine an object held at some height above the ground. It is released and falls toward the ground. Ignoring air resistance or friction, which of the following must be true?
  1. Before it falls, all of its energy must be potential energy.
  2. At the end of its fall, all of its energy must be converted to kinetic energy.
  3. During its fall, the combination of its kinetic and potential energy must equal the amount of potential energy with which it started.
  4. All of the above are true?
An object with the mass of .1 kg was dropped from a cliff 200 m high. Immediately before hitting the ground, it was clocked to travel with the speed of 40 m/s. Calculate how much energy was dissipated by the air drag.
  • 120 J
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