Mechanical Advantage and Efficiency

The _________ of a machine is always less than 100%.

• mechanical advantage

• friction

• force

• efficiency

Tags

NGSS.MS-ETS1-1

All simple machines help make work _________.

• harder

• smaller

• lighter

• easier

The efficiency of a machine can be increased by reducing __________________________. 

• effort

• resistance friction

• fulcrum

• friction

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

• 0.5

• 2

• 3

• 6

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?

• 1

• 10

• 100

• 1000

The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)

• 2.4

• 3.4

• 4.4

Tags

NGSS.MS-ETS1-1

Which of the lever would it take less force to lift?

• Lever A

• Lever B

If the distance from the effort to the fulcrum is greater than the distance from the load to the fulcrum, then

• the effort has a mechanical advantage

• the lever has a mechanical advantage

• the fulcrum has a mechanical advantage

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How much effort would it take to lift Lever A?

• 60 N

• 50N

• 40 N

• 30 N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How much effort would it take to lift Lever B?

• 60 N

• 50 N

• 40 N

• 30 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4