In which of the following cases forces may not be required? To keep:
Correct answer: B. The momentum of the particle remains constant
- A. A particle moving in a circular path
- B. The momentum of the particle remains constant
- C. A particle moving along a straight line with constant speed
- D. Constant acceleration of the particle
Explanation
If momentum is constant then no net external force is required (Δp/Δt = 0). Options A and D require forces; C requires no net force only if speed and direction both constant.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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