A body is moving along a straight path. What will happen to the body in the absence of an external field?
Correct answer: C. It will move with the same speed along the same straight path
- A. It will stop
- B. It will move with the same speed in a different path
- C. It will move with the same speed along the same straight path
- D. It will move with a reduced speed along the same path
Explanation
In absence of external forces (fields), Newton's first law implies the body continues in uniform motion: constant velocity along the same straight path, i.e. same speed and direction.
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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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