WAEC Physics 2013 Objective — Question 13

Question 13 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.

From Newton's first law of motion,

A. a body can only undergo translational motion
B. once a body remains at rest no force acts on it
C. the net force acting on a body in uniform linear motion is zeroCorrect
D. a body's inertia is its weight

Explanation

Newton's first law implies that a body at constant velocity (including at rest) has zero net force acting on it. The addition of all forces on it sums to zero — that does not mean no forces act on it.

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