Momentum, Impulse, & Newton's 3rd Law

What is the momentum of a 2300 kg SUV driving at 10 m/s in reverse?

• 23,000 kg·m/s, backward

• 230 N·s, backward

• 0 kg·m/s, since it's not moving forward

• 230 kg·m/s, backward

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Which has more momentum a meteorite (50 kg) zipping by the Earth at 15000 m/s or an SUV (5000 kg) driving at 15 m/s?

• The meteorite has 10 times more momentum.

• The SUV has 1`00 times more momentum.

• They have the same momentum

• You can't tell, since the meteorite is in space.

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NGSS.HS-PS2-2

A ball is dropped from a couple of meters above the ground. What happens to its momentum as it falls?

• It increases since the speed increases.

• It stays the same since the mass doesn't change.

• It decreases since the weight gets smaller.

• It doesn't change since the speed doesn't change.

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NGSS.HS-PS2-2

Momentum can best be defined as…

• an object maintaining its current state of motion

• A net force acting for a certain time

• Inertia in motion

• the mass of an object

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Newton's Third Law is often called the Law of Action & Reaction. For what reason is this a bad name for it?

• The two forces happen at the same time

• The two forces are unequal in size

• It is a law of forces, unlike Newton's other laws fo motion

• It is only called the Law of Inertia

A 100 N resistive force is applied to a 5 kg object moving at 20 m/s for 1 second. What will be its speed at the end of that time?

• 0 m/s

• 40 m/s

• Still 20 m/s

• 20 m/s, but backward

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Newton's 3rd Law led to the discovery of the…

• Law of Conservation of Momentum

• Law of Conservation of Force

• Law of Conservation of Energy

• Law of Conservation of Velocity

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NGSS.HS-PS2-2

A 35 N force acts on a cat for 3 s. What will be the impulse acting on the cat?

• 105 N·s

• 11.67 N/s

• 38 N·s

• 0.086 kg·m/s

If the action force is : Frog pushes down on ground with 2.6 N, which of these is the reaction force?

• Ground pulls up on frog with 2.6 N + the frog's weight.

• Frog pulls Earth up with a force of 2.6 N.

• Earth pulls frog down with a force equal to its weight.

• Ground pushes up on frog with 2.6 N.

As a person is being tossed up into the air. What happens to the magnitude of their momentum while they are moving upward?

• It increases since they are no longer supported by the other people.

• It decreases since their speed decreases.

• It doesn't change since their mass is constant.

• It increases since the positive direction is upward.

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