In which of the following cases forces may not be required? To keep the:
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
The correct answer is Option B: 'The momentum of the particle remains constant.' This indicates no net external force is acting on it, in accordance with Newton's first law and the principle of conservation of momentum. Option A is incorrect because circular motion requires a centripetal force to maintain the path. Option C is incorrect in the context of the question, as it assumes no resistive forces; however, if there are resistive forces present, a force is required to maintain the constant speed. Option D is incorrect because constant acceleration necessitates a continuous net force, as described by Newton's second law.
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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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