Simple Machines

What is a Mechanical Advantage?

• A mechanical advantage is the amount of help you can get by using a simple machine.

• A mechanical advantage is the force you apply onto a simple machine.

• A mechanical advantage is the opposing the movement of load or other forces.

• None of the above

Picture 1 is an example of :

• A lever

• A pulley

• A wedge

• A wheel & axle

Which of the following statements are true about Picture 1?

• b is the fulcrum, c is the resistance, a is the effort.

• b is the resistance, c is the fulcrum, a is the effort.

• b is the fulcrum, a is the effort, c is the resistance.

• b is the resistance, a is the fulcrum, c is the effort.

In figure 1: if the distance from a to b is 20 cm, and the distance from a to c is 80 cm, then the mechanical advantage of the system is :

Hint: MA = effort arm/ resistance arm

• 20

• 80

• 4

• 1/4

If the mechanical advantage of a simple machine is 4, then the:

• output force is 4 times the mechanical advantage.

• effort is 4 times the output force.

• efficiency is 4%.

• the work output is 4 times the input.

A knife is an example of a (an):

• Wedge

• Pulley

• Ramp

• Inclined plane

A pulley system has 3 sections of ropes that lift the load. The mechanical advantage of the system is:

• 0

• 1

• 2

• 3

Lucky Guess!

• Lucky Guess

• Lucky Guess

• Lucky Guess

• Lucky Guess