Let's practice using the mechanical advantage equation.
Mechanical Advantage Formula
Mechanical Advantage = Force Output ÷ Force Input
For instance, if a machine allows you to move an 80 newton rock (a rock which is exerting 80 newtons of downward force), it has a force output of 80 newtons. If you are only exerting 20 newtons of force, there is a force input of 20 newtons. You could measure the advantage of using the machine by dividing 80 newtons by 20 newtons, as follows:
MA = force output / force input
MA = 80 newtons / 20 newtons
MA = 4
This means that the machine increases the force you apply by 4. The machine allows you to be four times stronger than you really are.
Your turn
Using the equation solve this problem. If a car is exerting a downward force of 200 N. You are exerting a force of 50 N, what is the mechanical advantage you need an inclined plane to have?
