Question

1. newtons first law of motion states that \an object at rest will stay at rest, and an object in motion will stay in motion unless acted on by ________.\

a. an outside force
b. a comet
c. a collision
d. an inside force

Explanation:

Newton's first law of motion (law of inertia) states that an object at rest remains at rest, and an object in motion remains in motion with constant velocity, unless acted upon by a net external force. Option A ("an outside force") matches this definition. Option B (a comet) is irrelevant, option C (a collision) is a type of interaction but not the general term for the cause of change in motion, and option D (an inside force) is incorrect as internal forces don't change the overall motion of the object system.

Answer:

A. an outside force