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A particle of mass m is acted upon by three forces F1, F2 and F3. The forces F2 and F3 are at right angles to each other, and the particle is in equilibrium. If F1 is withdrawn, the particle’s acceleration becomes

1. F1/m
2. F2F3/mF1
3. (F2 − F3)/m
4. F2/m

Correct answer: F1/m

Solution

When the particle is in equilibrium, the net force acting on it is zero, meaning the forces balance each other out. If F1 is removed, the remaining forces F2 and F3 will no longer be balanced, resulting in an acceleration equal to the net force (which is F1) divided by the mass (m), hence the acceleration becomes F1/m.

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