Chapter 6, 7 and 8 - Newton's 2nd and 3rd Laws and Momentum Flashcards

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1
Q

Directly proportional means as one variable increases the other variable _________ .

A

Increases.

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2
Q

Inversely proportional means as one variable increases the other variable _________ .

A

Decreases.

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3
Q

According Newton’s 2nd Law, force and acceleration are __________ related.

A

Directly

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4
Q

According Newton’s 2nd Law, mass and acceleration are __________ related.

A

Inversely

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5
Q

What causes an object to accelerate?

A

Unbalanced forces.

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6
Q

When the air resistance force on an object builds up to where it equals the weight of the object, it stops accelerating. What is this speed (or velocity) called?

A

Terminal speed (or terminal velocity)

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7
Q

Newton’s third law states that whenever one object exerts a force on a second object, he second object exerts an _______ and ________ force on the first object.

A

Equal and opposite.

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8
Q

What is the reaction force to a tire pushing on a road?

A

The road pushing on the tire.

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9
Q

What is the reaction force to Earth’s gravity pulling on a falling ball?

A

The falling ball’s gravity pulling on the Earth

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10
Q

What word describes inertia in motion?

A

Momentum

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11
Q

Momentum is the product of what two factors?

A

mass and velocity

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12
Q

The change in momentum depends on the force that acts and what else?

A

The length of time it acts.

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13
Q

Impulse is the product of what two factors?

A

Force and the time interval over which it acts.

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14
Q

If you lengthen the time over which a change in momentum occurs, the force of impact ________ .

A

Decreases

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15
Q

In the absence of an external force, the momentum of a system remains _________ .

A

Constant or unchanged. This is the law of conservation of momentum.

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