Mechanical Advantage and Efficiency

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

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

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

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 the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the 1machine?

• 0.25 J
• 26%
• 386%
• 3.86 J

What is the efficiency of the machine if the input is 263 J and the output is 142 J? 

• 6.26%
• 54%
• 100%
• 260%

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

Work is calculated with the equation work = force / distance

• True

• False

How can you increase the mechanical advantage of an inclined plane?

• Decrease the angle of the plane

• Increase the length in proportion to the vertical height

• Both of these

• None of these

Choose all that increase the distance over which the force is applied

• Rakes

• Pliers

• Wheels

• 2 of these

Tags

NGSS.MS-PS2-2

Diana raises a 1000 N piano a distance of 5.00 m using a set of pulleys. She pulls in 20.0 m of rope. How much effort force did Diana apply if this was an ideal machine?

• 450 N

• 325 N

• 150 N

• 250 N

Tags

NGSS.MS-PS2-2