Unit 2 Mid Unit Review

• Work, Power and Machines

amount of energy transferred per unit time.

measurement of power

movement toward/away from a reference point

displacement of an object due to force

measurement of work

a push or a pull

device make of two or more simple machines

a sloping surface, used for raising heavy bodies.

force applied to a simple machine

Tea device with few or moving parts used to make work easier

force applied to an object by a machine

wheel with a grooved rim used with a rope or chain

&

Standard Unit of Measure

work

power

joule

watt

Mark uses a wheelbarrow to haul flowers at his job as a landscaper. He pushes a 15 kg wheelbarrow a distance of 5 m with a force of 30 N. How much work does she do?

Doug dug a hole in his yard to repair a pipe. It took him 10 seconds
to apply a force of 300 N to push a shovel 1 m into the
ground. How much power was used?

What simple machines are included in this compound machine?

1. levers/wedges
2. wheel and axle/lever
3. lever/pulley
4. wedge/pulley

How much work is done if a force of 25 N is applied 6 m?

What simple machines are included in this compound machine?

1. wheel and axle/levers/wedges
2. wheel and axle/lever/pulley
3. wedge/lever/pulley
4. wheel and axle/wedge/pulley

Determine how much power is used in 10 seconds if 5 N of force are used over 10 m.