Law's of Motion Section 3

What is Newton's 3rd Law of motion?

• An object in motion will stay in motion unless acted on by an outside force.

• Force is the product of mass and acceleration.

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

• There are only two Laws of Motion

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According to the third law of motion, action and reaction forces act on

• The same object

• Different objects

• The ground

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Write down an example of Newton's third law

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What is the momentum formula?

• p=mv

• p=ma

• p=F/d

• p=v/t

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What is the Momentum of a car with a mass of 1,000 kg traveling at a speed of 18 m/s?

• 55.6 kg x m/s

• 1.8x10^7 kgxm/s

• 18,000 kg x m/s

• 18 kg x m/s

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What is the mass of a person walking at a speed of 0.8 m/s if their momentum is 52 kg x m/s?

• 65 kg

• 6.5 kg

• 41.6 kg

• 25 kg

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Find the momentum of a 5 kg object moving 3 m/s.

• 15000 kg x m/s

• 1.6 kg x m/s

• 50 kg x m/s

• 15 kg x m/s

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How do the mass and velocity of a moving object affect its momentum?

• As mass or velocity increase, momentum increases

• As mass or velocity increase, momentum decreases

• As mass or velocity decrease, momentum increases

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Which of the following is an example of Newton’s Third Law of Motion?

• Rowing a boat (When you move forward, paddle pushes water backwards causing you to move forward)

• A rocket launch (burning fuel causes rocket to push forward, as the exhaust gas pushes backwards)

• Swimming(swimmer pushes against water as water pushes against the swimmer)

• All of the above are examples of Newton’s 3rd law.

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Use the momentum formula to determine which object has the largest momentum

• A 1,000 kg object moving 4 m/s

• A 100 kg object moving 5 m/s

• A 3,000 kg object moving 1.5 m/s

• A 100 kg object moving 50 m/s

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