Work, Power & Machines Quiz

True or false

You do work only when you exert a force on an object and ....

• destroy it completely

• move it move a distance

• change its shape

• make it bigger

The SI unit for Force is the....

• newton

• gram

• joule

• watt

The SI unit for Work is the ...

• newton

• joule

• meter

• watt

If you push a cart with a force of 60 N for 2 meters, how much Work have you done?

• 120 J

• 30 J

• 120 N

• 30 N

Work transfers this....

• power

• energy

• velocity

• effort

What is Power?

• work per unit of time

• force per unit of distance

• total energy used

• force over a time interval

In order for Work to be done, what must be true?

• Force acts in the same direction as the distance traveled.

• Force and distance are in opposite directions.

• Force is greater than distance.

• Distance is greater than force.

True or False: A man would do more Work if he pushes a box up a ramp faster.

• True

• False

Work of 20 J is required to push an object 1.5 km. Using the Work Triangle. calculate the Force:

• 25 N

• 13.3 N

• 16 N

• 12.6 N

You do 40 joules of work lifting a 10N box. Using the Work Triangle, how high is the shelf you move it to.

• 400m

• 40m

• 50m

• 4m