MA, Work and Power

Which of the following is true for the picture?

• elephant is the fulcrum, mouse is the effort, triangle is the load
• mouse is the fulcrum, triangle is the effort, elephant is the load
• triangle is the fulcrum, mouse is the effort, elephant is the load

How much work is produced when 350 N is used to move a car 5 m (W=Fd)?

• 70 J
• 1750 J
• 355 J
• 175 J

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

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

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

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

the rate at which work is done

• power

• work

• machine

• efficiency

A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?

• 5.5 N
• 40.7 N
• 87.3 N
• 2640 N

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?

• 500 N
• 1000 N
• 2000 N
• 8000 N

What is the formula for calculating the mechanical advantage of a lever?

• MA = effort arm + resistance arm

• MA = effort arm - resistance arm

• MA = effort arm * resistance arm

• MA = length of effort arm / length of resistance arm

The ideal mechanical advantage of a ramp was calculated to be 2.6. Its actual mechanical advantage was calculated to be 1.7. What is its % efficiency?

• 65.38%
• 55.75%
• 78.95%
• 42.31%