Consider the situation:

Abaseballis brought to a stop upon hitting the catcher'smitt.

In this situation,work is done on thebaseballby the

		the force of gravity on the baseball.
		the force of the catcher's mitt pushing against the baseball.
		the force of the pitcher who threw the baseball.
		the force of the baseball pushing the mitt forward.

Consider the situation:

The downward movinghammerstrikes the nail and slows down.

In this situation,work is done on thehammerby the

		the hammer pushing downward on the nail.
		the hand pushing downward on the hammer.
		the wood board pushing upward on the nail.
		the nail pushing upward on the hammer.

Match the following situations with the type of work done on the object inbold.Choices arepositive,negative,orzero.

- A. B. C.	The weightlifter lifts thebarbellabove her head.
- A. B. C.	Jonah holds thedogtightly by its leash to prevent it from moving.

A.	Positive Work
B.	Negative Work
C.	Zero Work

Work done on an object or system of objects causes a transformation of energy. Consider the following situation:

Along the horizontal section at the bottom of a tall slide, a child slows to a stop.

This situation can best be described as a transformation of

		Potential energy into Chemical energy.
		Kinetic energy into Chemical energy
		Potential energy into Kinetic energy.
		Kinetic energy into Dissipated energy (such as heat)

Work done on an object or system of objects causes a transformation of energy. Consider the following situation:

Starting from rest at the top of the friction-free slide, the child slides to the bottom.

This situation can best be described as a transformation of

		Potential energy into Kinetic energy.
		Chemical energy into Kinetic energy.
		Dissipated energy (such as heat)into Kinetic energy
		Kinetic energy into Chemical energy.

Match the following descriptions with the most appropriate type(s) of energy. Choices are:kinetic energy,gravitational potential energy, both, or neither.

- A. B. C. D.	A high school sprinter is moving at a high speed as she crosses the finish line.
- A. B. C. D.	An eagle is soaring along above a river, looking for an easy catch.
- A. B. C. D.	A backpack is at rest on the classroom floor.
- A. B. C. D.	A physics book is hanging from the ceiling of the room above a student's desk.

A.	Gravitational PE
B.	KE
C.	Both of these
D.	Neither of these.