Work Power and Simple Machines

A mechanic uses a hydraulic lift to raise a 1,500kg car 2 meters off the ground. How much work does the lift do on the car? (Hint: Use F_W=mg to calculate Force first... g=9.8 m/s²)

• 3000N

• 3000J

• 14,700 J

• 29,400 J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following levers has the largest mechanical advantage?

• Lever A

• Lever B

• Lever C

• All 3 levers have the same mechanical advantage

Look at the image below showing a forklift being used to load a truck. Suppose the motor on teh forklift does not have enough force to carry the pallet of boxes up the ramp. How could the ramp be changed, if at all, so the forklift could perform the job?

• steepen the ramp

• shorten the ramp

• lengthen the ramp

• no change will help

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following pulleys shown is a block and tackle system?

• A and B

• C and D

• C, D, and E

• Only E

A _______ is a simple machine that is an inclined plane wrapped around a cylinder.

A ________ is a grooved wheel with a rope, simple chain, or cable running along the groove.

An __________ _________ is a sloping surface that reduces the amount of force required to do work.

A ___________ is a rigid arm that turns around a fixed point called a fulcrum.

What type of lever is shown here?

• 1st class lever

• 2nd class lever

• 3rd class lever

• movable lever

What type of lever is shown here?

• 1st class lever

• 2nd class lever

• 3rd class lever

• block and tackle lever