Understanding Newton's First Law of Motion

What does the law of inertia state about objects at rest?

• They will move randomly

• They will remain at rest

• They will slow down

• They will accelerate

What must happen for a motionless object to start moving?

• It must be observed

• It must be in a vacuum

• It must decay

• An external force must be applied

Which two forces were mentioned as affecting the motion of a rolling ball?

• Friction and gravity

• Electricity and wind

• Magnetism and gravity

• Light and sound

If there were no gravity or friction, what would happen to a moving object?

• It would stop eventually

• It would change direction

• It would vanish

• It would continue moving