WAEC Physics 2020 Objective — Question 26

Question 26 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.

The net force on the ball along the plank is

A. mg sin(theta) + F
B. F - mg cos(theta)
C. mg sin(theta) - FCorrect
D. F + mg cos(theta)

Explanation

Since the ball slides down the plank (motion is downward, and a=0 initially before considering net motion), mg sin(theta) acts down the plank while friction F opposes it; from Newton's second law, the net force along the plank is mg sin(theta) - F.

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