Suppose that with a pulley system, you need to exert a force of 1,400 N to lift a heavy object. But without the pulley system, you need to exert 4,200 N to lift the object. What is the mechanical advantage of the pulley system

3

Explanation:

Mechanical Advantage: This can be defined as the ratio of the load to the effort of a machine. Mechanical advantage has no unit because it is a ratio of two quantity of the same unit.

It can be expressed as

M. A = L/E ... Equation 1

M. A = Mechanical advantage, L = Load, E = Effort.

Given: L = 4200 N, E = 1400 N

Substitute into equation 1

M. A = 4200/1400

M. A = 3

Hence the mechanical advantage of the pulley system = 3