Mechanical Advantage of Inclined Plane and Pulley

Review - Simple Machines

Open Ended

Name a type of simple machine (there are six)

Multiple Choice

Which of the following does a simple machine do?

• allows the users to apply less force over a longer distance

• reduce the amount of force needed to do work

• change the direction of the applied force

• all of the above

Multiple Choice

An inclined plane wrapped around a rod forms this simple machine 

• lever

• pulley

• screw

• wedge 

Multiple Choice

The arrow is pointing to...

• The load

• The effort

• The fulcrum

• The input force

Multiple Choice

An axe is an example of a

• pulley

• inclined plane

• screw

• wedge 

Multiple Choice

A seesaw is an example of a  

• wedge

• lever 

• inclined plane 

• pulley 

Multiple Choice

Which is not a type of simple machine?

• spring

• screw

• pulley

• wedge

Multiple Choice

What type of lever is this?

• 1st class lever

• 2nd class lever

• 3rd class lever

• This is not a lever

Multiple Choice

What type of simple machine is this?

• wheel and axle

• gear

• lever

• inclined plane

Multiple Choice

What lever type is this?

• 1st class lever

• 2nd class lever

• 3rd class lever

• Not a lever

Multiple Choice

This picture is an example of a _________.

• pulley

• wedge

• wheel and axle

• screw

Multiple Choice

What is this simple machine

• Pulley

• Wheel and axle

• Lever

• Screw

Multiple Choice

What lever type is this?

• 1st class lever

• 2nd class lever

• 3rd class lever

• Not a lever

Multiple Choice

Which of these is an example of a wedge?

• Knife

• Stairs

• Skateboard

• Broom

Mechanical Advantage

What is it and how is it calculated?

What is Mechanical Advantage?

An inclined plane (ramp), a lever, a pulley, a wedge, a
wheel-and-axle, and a screw are considered the six kinds of
simple machines.

These simple machines are commonly used to provide
mechanical advantage. That is: simple machines allow a
small force (effort)to do a job that would require a greater force
(load) without the simple machine.

The mechanical advantage (M.A.) is the ratio of the load to the
effort. Or, M.A. = (load force) / (effort force)

How is it Calculated?

For any simple machine the mechanical advantage can be
calculated as shown at the end of the previous slide:

M.A. = (load force) / (effort force)

However, the theoretical mechanical advantage for each kind of
simple machine can be calculated from features of the simple
machine. These formula are on the following slides.....

Multiple Choice

Calculate the mechanical advantage in this image

• 3N

• 40N

• 20N

• 10N

Multiple Choice

Calculate the mechanical advantage in the image.

• 30N

• 20N

• 10N

• 5N

Multiple Choice

Calculate the mechanical advantage of the pulley.

• 105N

• 95N

• 5N

• 2N