Question

1. a crowbar is used to lift a heavy rock. the effort arm is 60 cm and the load arm is 10 cm. calculate the mechanical - advantage and explain what this value means in physical terms. make sure to include work (including equations) for all calculations (steps of process). do not include units where necessary.

Explanation:

Step1: Recall mechanical - advantage formula

The mechanical advantage (MA) of a lever is given by the formula $MA=\frac{\text{load arm}}{\text{effort arm}}$.

Step2: Substitute given values

Given effort arm = 60 cm and load arm = 120 cm. So, $MA=\frac{120}{60}$.

Step3: Calculate the value

$MA = 2$.

Step4: Explain the meaning

A mechanical - advantage of 2 means that the force applied (effort) is multiplied by 2. In other words, to lift the load, you only need to apply a force that is half of the weight of the load.

Answer:

The mechanical advantage is 2. It means the force applied is multiplied by 2, and you can lift the load with a force that is half of the load's weight.