Newtons 1st Law

What does Newton's First Law of Motion state about an object's state of motion?

• An object at rest will eventually move, and an object in motion will eventually stop.

• An object at rest will remain at rest, and an object in motion will remain in motion unless acted upon by an external net force.

• An object's motion is always changing due to internal forces.

• An object will only move if a constant force is applied to it.

Why does a hockey puck eventually stop when pushed on ice, but would glide indefinitely if there were zero friction?

• The puck runs out of kinetic energy.

• The ice surface has some friction, which acts as an external net force.

• Gravity pulls the puck down, causing it to stop.

• The puck's inertia eventually wears off.

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What is the relationship between an object's mass and its inertia?

• Mass and inertia are unrelated concepts.

• Objects with less mass have greater inertia.

• Inertia is proportional to an object's mass.

• Mass is a measure of an object's velocity, not inertia.

In a car accident, why does a person's body tend to continue moving forward even after the car stops?

• The car's engine is still pushing the person forward.

• The person's body has inertia, which resists the change in motion.

• Air resistance pushes the person out of the car.

• The seatbelt causes the person to move forward.