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WAEC Physics 2014 Paper

Question : 4

Total: 48

When the linear momentum of a body is constant, the net force acting on it

Solution:

Concept:

Newton's second law states that net force equals the rate of change of linear momentum.

Explanation:

The relation is given by

F_{\text{net}} = \frac{dp}{dt}

When linear momentum

p

remains constant, its change with time is zero, so

\frac{dp}{dt} = 0

Substituting this into the relation gives

F_{\text{net}} = 0

Thus, no net force acts on the body when its momentum is constant.

Answer:

A. is zero

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