Newton's First Law of Motion

What does Newton's First Law of Motion state?

• An object at rest will remain at rest, and an object in motion will remain in motion at a constant speed and in a straight line unless acted on by an unbalanced force.

• An object will accelerate when a force is applied.

• For every action, there is an equal and opposite reaction.

• Energy cannot be created or destroyed.

What will happen to objects at rest, such as a chair, desk, or book, if no force is placed on them?

• They will move by themselves.

• They will remain at rest.

• They will disappear.

• They will change shape.

What type of force is acting on the golf ball when it is at rest?

• Balanced force

• Unbalanced force

• Gravitational force

• Frictional force

Scenario: You are riding a bus to school. When you finished your candy bar, you stand up to walk to the front of the bus. SUDDENLY, a mouse runs in front of the bus and the bus driver slams on his brakes (he loves mice). What will happen to you? Why?

• You will fall forward because of inertia.

• You will remain standing because of balance.

• You will fall backward because of the sudden stop.

• You will not be affected at all.

Newton says, 'an object in motion will stay in motion forever...unless acted on by a(n) _______ force.' Fill in the blank.

• unbalanced

• balanced

• gravitational

• magnetic

If you push your desk, what will happen?

• It will move

• It will stay still

• It will disappear

• It will break

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What makes it stop?

• Friction

• Gravity

• Momentum

• Inertia

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What is the relationship between mass and inertia?

• The larger the mass, the less the inertia.

• The smaller the mass, the less the inertia.

• Mass does not affect inertia.

• Inertia is independent of mass.

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How does this relate to Newton’s first law?

• It describes the motion of objects in equilibrium.

• It explains the relationship between force and acceleration.

• It states that an object will remain at rest or in uniform motion unless acted upon by an external force.

• It defines the concept of gravitational force.

The tendency of an object to resist changes in its motion is...

• inertia
• force
• acceleration
• velocity