Work, Energy and Power Flashcards

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1
Q

What is work done?

A

Force x distance

Equal to the energy transferred from one form to another.

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2
Q

What is a joule?

A

One Joule is the work done when a force of 1 newton moves an object through a distance of 1 metre.

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3
Q

What is the principle of conservation energy?

A

Energy cannot be created or destroyed. Energy can be transferred from one form to another but the total amount of energy in a closed system will not change.

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4
Q

What is kinetic energy?

A

The energy of a body due to its motion.

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5
Q

What is gravitational potential energy?

A

The energy of an object has due to its position in a gravitational field.

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6
Q

What is power?

A

Rate at which work is done

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7
Q

What is a Watt?

A

The rate of energy transfer that is equal to 1 joule per second

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8
Q

How do you derive power = force * velocity?

A
  1. P = W/t
  2. W = Fx
  3. P = Fx/t
  4. v = x/t
  5. So P = F x v
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9
Q

What is impulse?

A

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

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10
Q

What is the area under a force-time graph?

A

Impulse

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11
Q

What is the conservation of momentum?

A

For a closed system, the total momentum of objects before a collision = total momentum of the objects after collison

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12
Q

What is a perfectly elastic collision?

A

A collision which there is no loss of kinetic energy in the collision

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13
Q

What is an inelastic collision?

A

A collision in which part of the kinetic energy before the collision is transferred to other forms of energy after the collision.

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