Newton’s Laws And Momentum Flashcards

1
Q

What is Newton’s First Law?

A

A body will remain at rest or continue moving in a straight line at constant velocity unless acted on by a resultant force.

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2
Q

What is Newton’s Second Law?

A

The rate of change of momentum of a body is equal to the resultant force and in the same direction.

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3
Q

What is Newton’s Third Law?

A

If body A exerts a force on body B then body B exerts an equal and opposite force on body A of the same type.

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4
Q

What are features of Newton’s Third Law?

A

Pair of forces have equal magnitude
Pair of forces act in opposite directions
The force acts on 2 different bodies (A and B)
Same type of force is acting on the 2 bodies

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5
Q

Define impulse

A

The product of force and time for which the force acts.

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6
Q

What is the equation for impulse?

A

ΔP = FΔt

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7
Q

How and from what graph can you calculate impulse from?

A

From a force time graph, impulse is the area under the graph.

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8
Q

State the principle of conservation of linear momentum

A

For any collision, the total initial momentum is equal to the total final momentum, if there are no external forces.

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9
Q

What is the equation for principle of conservation of linear momentum?

A

ΔP1 = -ΔP2
mv1 - mu1 = mv2 - mu2

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10
Q

What is an elastic collision?

A

A collision where total kinetic energy is conserved.

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11
Q

What is an inelastic collision?

A

A collision where total kinetic energy is not conserved.

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12
Q

What is true about all collisions?

A

Total energy and momentum are conserved.

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13
Q

What happens in terms of energy and momentum in an explosion?

A

There is a gain in kinetic energy due to the energy of the explosion. Total momentum is conserved.

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