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Physics

Force and Motion

Quick fact

A spacecraft drifting in deep space can travel at constant velocity forever with no force acting on it—only a force (like a thruster) would alter its motion.

Why this is interesting

Have you ever wondered why a ball rolling across a floor eventually stops? Is it because it 'runs out' of force? The answer might surprise you: it's actually the opposite—forces are what cause motion to change, not to continue.