Newton's Laws of Motion

Unless acted upon by an outside force, an object at rest stays at rest; an object in motion stays in motion.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

The magnitude of force is equal to the mass multiplied by the acceleration of an object.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

For every action there is an equal and opposite reaction.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

An object is resting motionless on a surface. According to Newton's 1st Law, the object will only start to move if

• the net forces on the object equal zero
• an unbalanced force is applied to the object
• the upward force of the object is equal to its acceleration
• two forces that are equal and opposite are applied to the object

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As the wheels of a train push down on the track, the track pushes back against the wheels. Which of Newton's laws is used to explain these forces.

• An object at rest tends to stay at rest unless acted upon by an unbalanced force.
• The net force of an object is its mass times its acceleration.
• For every action, there is an equal and opposite reaction.
• Any 2 objects exert a gravitational force of attraction on each other.

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Which example best explains Newton's Third Law of Motion?

• When a glass slid across a table, it spilled water when it stopped suddenly.
• An engine used less work to move a lighter car than when it moved a heavier car.
• When you sit on a chair, your body exerts a downward force on the surface of the chair, while the chair exerts an equal and upward force on your body. 

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A truck that is travelling at a constant speed is carrying some boxes.  If the truck comes to a sudden stop, what will most likely happen to the boxes?

• They will stay in the middle of the truck.
• They will slide toward the front of the truck.
• They will slide toward the back of the truck.
• They will fall off the side of the truck.

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A _______ is a push or pull.

• Newton
• Acceleration
• Momentum
• Force

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What is the standard unit force is measured in?

• Newton

• Kilogram

• Pound

• Meter

• m/s²

What Newton's law does this picture represent?

• Newton's 2nd law
• Newton's 1st law
• Newton's 3rd law
• Newton's 5th law

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