Question

Name a machine which is used to be a multiply force.

• A. a moveable pulley.
• B. a fixed pulley.
• C. a fixed pendulum.
• D. a moveable pendulum.

Answer 1

The correct option is A a moveable pulley.

A Wheel and Axle can be used to multiply Force
The wheel and axle consists of a wheel or crank that is rigidly attached to an axle. A wheel and axle is similar to a lever with unequal arms. The ideal mechanical advantage of the wheel and axle is $IMA=R/r$
where, R = radius of the wheel
r = radius of the axle
The wheel and axle is often used to multiply speed instead of force. Example: wheels on bicycles and motor vehicles.