A force of 30 N is applied to a screwdriver to pry the lid off of a can of paint. The screwdriver applies 75 N of force to the lid. What is the mechanical advantage of the screwdriver?

The formula of mechanical advantage in this situation is:

MA = Input Force : Output Force

The input force is the 30N applied to a screwdriver while the output force is the 75N force to the lid.

So,

MA = 30N/75N

MA = 0.40

Hence the mechanical advantage of the screwdriver is 0.40.