Question

What is the best way to test how the length of a lever's arm affects the amount of force you need to use?

(1 point)
Responses

Measuring the total work done without changing any variables.
Measuring the total work done without changing any variables.

Changing the load's weight while keeping the arm length constant.
Changing the load's weight while keeping the arm length constant.

Varying the effort arm's length while keeping the load constant.
Varying the effort arm's length while keeping the load constant.

Increasing both the load's weight and the effort arm's length.
Increasing both the load's weight and the effort arm's length.

Answer 1

Varying the effort arm's length while keeping the load constant.

Reason: That isolates the arm length as the only independent variable, so any change in required force is caused by the lever arm length rather than changes in the load.