Work, Power and Simple Machines Notes Quiz

Work =

• force x distance

• force / distance

• distance / force

• force²

For work to be done, force must be exerted over a

• bridge.

• time period.

• distance.

• cup of coffee.

How much work does a 25 Newton force do to lift a potted plant form the floor to a shelf 1.5 m high?

• 16.67 joules

• 16.67 Newtons

• 37.5 Newtons

• 37.5 joules

Calculate the amount of work it takes to lift a box 2 meters that requires 10 Newtons of force.

• 5 joules

• 20 joules

• 20 Newtons

• 5 Newtons

Power =

• work x time

• time x work

• time / work

• work / time

The fast work it done,

• the less power it requires.

• the more work it requires.

• the less work it requires.

• the more power it requires.

The SI unit for power is

• Newtons

• watt

• joule

• volt

How much power is done by a jack that does 50 joules of work in 10 seconds?

• none

• 5 watts

• 500 watts

• 5 joules

Who has done the most work?

• The guy on the left

• The guy on the right

• They both did the same amount

• Neither did any work

Machines...

• make work harder by changing size, direction or distance of the force needed to do work.

• make work easier by changing size, direction or distance of the force needed to do work.

• are dangerous and should be avoided.