Work and Power Review

Multiple Choice

What is the relationship between work and power in energy transfer?

• Work is the same as power

• Power is the rate of doing work

• Work is not related to energy

• Power is only about speed

Open Ended

if you push a cart with a force of 60 N for 2 m... how much work have you done. Show all of your work.

Multiple Choice

If 150 Joules of work is needed to move a box 10 meters, what force was used? 

• 1500 N
• 15 N
• 1.5 N
• 150 N

Multiple Choice

In order to do work on an object, the force you exert must be...

• The maximum amount of force you are able to exert.
• In the same direction as the object's motion.
• In a direction opposite to Earth's gravitational force.
• quick and deliberate.

Multiple Choice

A student pushes a desk with a constant force of 50 Newtons across the classroom floor for a distance of 3 meters. How much work was done on the desk?

• 50 Joules

• 100 Joules

• 150 Joules

• 200 Joules

Fill in the Blanks

work is done by a force acting perpendicular to an object’s displacement.

Fill in the Blanks

A crane uses an average force of 5200 N to lift a girder 25 m. How much work does the crane do on the girder?

W =

J

Multiple Choice

What is the definition of power in physics?

• The rate at which work is done

• The total energy consumed

• The force applied over a distance

• The mass of an object

Multiple Choice

What is the power output of Crane A and Crane B when lifting the same 1000N beam to a height of 10m?

• 500 Watts

• 1000 Watts

• 1500 Watts

• 2000 Watts

Multiple Choice

Calculate the power used by the student running up the stairs if they do 2000 J of work in 5 seconds.

• 200 W

• 300 W

• 400 W

• 500 W

Multiple Choice

If a machine does 300 joules of work in 15 seconds, what is its power output?

• 15 watts

• 20 watts

• 25 watts

• 30 watts