Mechanical Advantage of Inclined Plane and Pulley

Mechanical Advantage

Multiple Select

MULTIPLE ANSWERS: A machine makes work easier by:

• Changing the amount of force you apply.

• Changing how quickly you apply the force.

• Changing the direction of the force you apply.

• Not allowing any work to occur.

Mechanical Advantage

Open Ended

Question 1 (Together): You apply a force of 15 newtons to a pulley, and the pulley exerts a force of 1,200 newtons. What is the mechanical advantage of the pulley?

Open Ended

Question 2 (On Your Own): You apply a force of 36 newtons to an inclined plane, and the inclined plane exerts a force of 9,000 newtons. What is the mechanical advantage of the inclined plane?

Open Ended

Question 3 (Together): A pulley has a mechanical advantage of 10.  What would the output force of the pulley be if you applied a force of 350 N to it?

Open Ended

Question 4 (On Your Own): A wedge has a mechanical advantage of 525.  What would the output force of the wedge be if you applied a force of 500 N to it?

Open Ended

A car drives from Shreveport to Dallas. What happens to the temperature of the tires during the trip?

Open Ended

Do you think all the force you apply to a machine turns into work done by the machine? Why or why not?

Ideal Machines and Work

• Ideal Machine – a machine in which there is no friction

• The input force is used entirely to do work on the machine

• This work causes an output force that does work on another object

• Since there is no energy loss (no friction!) the work done on the machine is the same as the work that the machine does

• work in = work out