Assertion (A): The mechanical advantage of class III levers is always less than 1.

Reason (R): This is because the effort arm is always greater than the load arm.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.

What is the ideal mechanical advantage of a single fixed pulley? Can it be used as a force multiplier?

In a single fixed pulley, if the effort moves by a distance x downwards, by what height is the load raised upwards?

Name a machine which is used to:

(a) multiply force

(b) multiply speed, and

(c) change the direction of force applied.