A particle is moving with a constant speed along straight line path. A force is not required to
Correct answer: D. Keep it moving with uniform velocity
- A. Change its direction
- B. Increase its speed
- C. Decrease its momentum
- D. Keep it moving with uniform velocity
Explanation
Newton's first law of motion, also known as the law of inertia, states that an object will remain at rest or move in a straight line at constant speed unless acted upon by an external force. This means that no force is needed to keep an object moving with uniform velocity. A force is only necessary to change the object's speed, change its direction, or alter its momentum. Thus, the correct answer is that no force is required to keep the particle moving with a uniform velocity. Other options, such as changing direction, increasing speed, or decreasing momentum, all require an external force to achieve.
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About Force and Motion
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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