Calculating Torque etc.

If a simple machine has an input force of 100 N and an output force of 500 N, what is its mechanical advantage (MA)?

• 0.2

• 5

• 10

• 600

What is the efficiency of a machine that requires 200 J of input work to produce 150 J of output work?

• 25%

• 50%

• 75%

• 100%

A lever has an effort arm of 5 m and a load arm of 1 m. What is the mechanical advantage of the lever?

Note: the inward force would be the effort.

• 0.2

• 1

• 5

• 6

If a torque of 60 Nm is applied to a wrench with a length of 0.5 m, what is the force applied at the end of the wrench?

• 30 N

• 120 N

• 300 N

• 600 N

A pulley system has an efficiency of 80%. If the input work is 100 J, what is the output work?

• 20 J

• 50 J

• 80 J

• 120 J

A machine has an output force of 1000 N and a mechanical advantage of 10. What is the input force?

• 10 N

• 100 N

• 1000 N

• 10000 N

If a wheel and axle machine has a radius of the wheel of 0.5 m and the radius of the axle of 0.1 m, what is its mechanical advantage?

• 0.2

• 5

• 10

• 0.5

What is the efficiency of a machine if the input force is 150 N, the output force is 75 N, and the distances moved by the input and output forces are equal?

• 50%

• 75%

• 100%

• 125%

A simple machine that consists a rigid bar that pivots on a fixed point

• lever

• pulley

• wheel and axle

• fulcrum