Mechanical Advantage and Efficiency

The amount by which a machine multiplies input force is known as the 

• work.
• power.
• output force.
• mechanical advantage.

What is the equation for mechanical advantage?

• MA=input force*output force
• MA=output force/input force
• MA=input force/output force
• MA= output force - input force

if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?

• 120 N
• 5 N
• 2000 N
• 80 N

Tags

NGSS.MS-PS2-2

What is the mechanical advantage if you lift a load of 300 newtons and you only push down with 50 newtons?

• 250
• 50
• 60
• 6

Tags

NGSS.MS-PS2-2

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?

• 1
• 10
• 1000
• 100

What is effort (input) force?

• the force one exerts on a machine

• the force which an effort force must overcome in order to do work on an object via a simple machine.

• the force the machine exerts on a object

• the output work times the input distance

Tags

NGSS.MS-PS2-2

If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?

• 2N
• 5N
• 10N
• 15N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What is something that makes machines lose efficiency?

• levers

• friction

• ice cream

• work

Which is a more efficient way of getting to school?

• skateboard

• walk

What is the formula for calculating mechanical efficiency?

• work output x work input ÷ 100

• work input ÷ work output x 100

• work output ÷ work input x 100

• work input x work output ÷ 100