Consider a ball thrown straight up in the air. At what position is its kinetic energy at a maximum? Where is its gravitational potential energy at a maximum?

A ball is thrown straight up into the air. Ignore air resistance. While the ball is in the air its acceleration (a) increases. (b) is zero. (c) remains constant. (d) decreases on the way up and increases on the way down. (e) changes direction.

Why does the force of gravity do no work on (a) a bowling ball rolling along a bowling alley and (b) a satellite in circular orbit about Earth?

At what point in its motion is the KE of a pendulum bob at a maximum? At what point is its PE at a maximum? When its KE is at half its maximum value, how much PE does it possess?

You throw a ball straight up into the air. It reaches a maximum height and returns to your hand. At what location(s) is the kinetic energy of the ball (a) a maximum and (b) a minimum? At what location(s) is the potential energy of the ball (c) a maximum and (d) a minimum?

A 60.0-kg person walks from the ground to the roof of a 74.8-m-tall building. How much gravitational potential energy does she have at the top of the building?

At what point in its motion is the KE of a pendulum bob at a maximum? At what point is its $\mathrm{PE}$ at a maximum? When its $\mathrm{KE}$ is at half its maximum value, how much PE does it have relative to its PE at the center of the swing?

Discuss the design of the roller coaster shown in the given sketch in terms of the conservation of energy.

Does the string that supports a pendulum bob do work on the bob as its swings to and fro? Does the force of gravity do any work on the bob?

A book sliding across a horizontal table slows down and comes to a stop. The book’s kinetic energy was converted into what form of energy ?

A physics instructor demonstrates energy conservation by releasing a heavy pendulum bob, as shown in the sketch, allowing it to swing to and fro. What would happen if, in his exuberance, he gave the bob a slight shove as it left his nose? Defend your answer.

How many watts of power do you expend when you exert a force of 6 N that moves a book 2 m in a time interval of 3 s?

Cite an example in which a force is exerted on an object without doing work on the object.

A crate is pulled across a horizontal floor by a rope. At the same time, the crate pulls back on the rope, in accord with Newton's third law. Does the work done on the crate by the rope then equal zero? Explain.