# Unit 2 Work, Energy and Machines

### 15 terms by wileyb

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### work

The use of force to move an object some distance in the direction of the force.

### equation for work

W = F x d
work = force x distance

### energy

is the ability to do work

### power

is the rate at which work is done

### equation for power

P = E/ t
power = energy divided by time

### joule

standard unit of measurement for both work and energy

### watt

is the standard unit of measurement for power

### potential energy

is the energy an object has because of its position, condition or chemical composition

### kinetic energy

is the energy of motion

### equation for kinetic energy

KE = 1/2mv2
kinetic energy = 1/2 mass x velocity squared

### elastic potential energy

is stored in a stretched spring or rubber band

### chemical potential energy

a substance stores energy as a result of its chemical bonds

### gravitational potential energy

is due to its position above the ground

### machine

any device that helps people do work

### six types of simple machines

levers, wheels and axles, pulleys, inclined planes, wedges and screws

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