Power, Work, and Machines

What is the unit of measurement for work?

• meters

• newtons

• m/s

• Joules

You have to push with 15 N of force to move it 10 meters. How much work do you do?

• 15 Joules

• 150 Joules

• 1.5 Joules

• .67 Joules

Answer explanation

Remember for work it is just force X distance.

500 J of work is done by a person who uses a force of 50N to move a box, how far does it go?

• 10 m

• 0.1 m

• 25,000 m

• 10 J

Answer explanation

For distance it is work/force.

Newtons are the unit for _____________.

• Work

• Distance

• Acceleration

• Force

The unit for work is

• meters

• joules

• newtons

• watts

_____________ is the rate of doing work.

• Conservation of energy

• Joules

• Energy

• Power

Power is measured in ___________.

• meters

• joules

• newtons

• watts

You do 40 Joules of work in 8 seconds. How much power did you exert?

• 0.2 watts

• 320 watts

• 5 watts

Will you use more power running up the stairs or walking up the stairs?

• Running up the stairs

• Walking up the stairs

• The same in both

Calculate the amount of power it takes 10 J of work to climb up the stairs in 5 seconds.

• 2 W

• 5 W

• 150 W

• 200 W