A mass accelerates uniformly when the resultant force acting on it is:
Correct answer: D. Constant but not zero
- A. Can be both 'zero' and 'constant but not zero'
- B. Increasing uniformly with respect to time
- C. Zero
- D. Constant but not zero
Explanation
The resultant force and acceleration are directly related to each other via the second law of motion:F = maSince uniform acceleration means constant acceleration, the force acting on the mass will be constant too. It cannot be zero because if the force is zero then the acceleration must be zero too.
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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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