Question 1

The unit used to measure pressure is a

Accepted Answer

Pascal

Answer

Newton

Answer

Joule

Answer

Hydraulic

Question 2

A light bulb takes in 500J of electrical energy to turn on.  If we only get 25J of light output, calculate the efficiency of the light bulb.

Accepted Answer

5%

Answer

105%

Answer

25%

Answer

20%

Question 3

The unit for measuring the amount of work done is a . . .

Accepted Answer

Joule

Answer

Pascal

Answer

Meter

Answer

Newton

Question 4

The amount of pressure produced by the small piston in a hydraulic system is ____________________ the amount of pressure on the large piston.

Accepted Answer

The same

Answer

Smaller

Answer

Larger

Answer

Almost equal

Question 5

In which situation would the mechanical advantage be less than one?

Accepted Answer

A teenager rides his mountain bike in the highest gear to the store.

Answer

A student pushes a wheelchair up a ramp.

Answer

A pulley system is used to make it easier to lift an engine out of a car.

Answer

A crow bar is used to pry open a crate.

Question 6

How much work is done when a person pulls a sled with a force of 300N a distance of 5m?

Accepted Answer

1500 J

Answer

1500 N

Answer

60 N

Answer

60 J

Question 7

In which situation is work NOT being done?

Accepted Answer

A child holds a 50N box of toys 0.5m off the ground.

Answer

A crane lifts a steel beam to the 3rd floor of a building

Answer

A boy uses 100N of force to push a box across a room.

Answer

A man pushes a car stuck in sand with 450N and it moves 0.2m.

Question 8

Jimmy does 75 000J of work riding a scooter to a friend’s house.  He exerts a constant average force of 75N.  How far away is his friend’s house?

Accepted Answer

1000 m

Answer

10 m

Answer

10 km

Answer

100 m

Question 9

What force can a hydraulic system lift if 50N of force is used on a 2cm2 input piston, where the area of the output piston is 10cm2?

Accepted Answer

250 N

Answer

500 N

Answer

1000 N

Answer

10 N

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