Answer: to come to rest.
- A to remain in uniform motion
- B to come to rest
- C to accelerate steadily
- D to move along a circle
Correct answer: B. to come to rest
Explanation: Aristotle treated rest as the natural state, so he thought a sustained force was needed for motion. Newton's first law shows uniform motion is just as natural a state as rest.
Free-body diagram of a block on an incline: weight (mg) resolves into mg sinθ along the slope and mg cosθ into the slope, balanced by the normal force N and friction f.
Concept context
Newton's three laws, friction, circular motion, and free body diagrams.