Machines and Energy Test c 13 Review

A bus engine transfers chemical potential energy into ______ so that the bus moves.

• kinetic energy

• potential gravitational energy

• electrical energy

• thermal energy

Increasing the speed of an object ______ its potential energy.

• increases

• changes

• does not affect

• decreases

When a machine is used to do work, the force applied by the machine is called the

• input force

• output force

• effort force

• potential force

As an object falls its potential energy is

• lost to the air above it.

• converted into chemical energy.

• lost to the air around it.

• converted to kinetic energy.

Lowering an object decreases its

• air resistance.

• gravitational pull.

• potential energy.

• chemical energy.

A slanted surface used to raise an object is a(n)

• inclined plane.

• screw.

• effort ramp.

• efficiency board.

The rate at which work is done is called

• force.

• power.

• effort time.

• efficiency.

An inclined plane wrapped around a cylindrical post is a ____.

• ramp

• screw

• block and tackle

• lever

The unit of power is the

• joule

• m/s

• watt

• second

Three of the following simple machines are basically the same. Which one does NOT belong with the group?

• lever

• pulley

• wedge

• wheel and axle