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GCSE PHYSICS (Improved) > P1-Conservation And Dissipation Of Energy > Flashcards

P1-Conservation And Dissipation Of Energy Flashcards

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1
Q

What are the 8 energy stores?

A

Thermal, kinetic, gravitational potential, elastic potential, nuclear, magnetic, chemical, and electrostatic

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2
Q

What are the 4 energy transfer pathways?

A

Mechanically, electrically, by heating, and by radiation (light of sound)

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3
Q

What is a system?

A

An object or a group of objects

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4
Q

Principle of conservation of energy

A

Energy cannot be created or destroyed

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5
Q

What is a closed system?

A

A system where neither matter nor energy can enter or leave

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6
Q

Energy transferred=

A

Work done

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7
Q

Ep=

A

mgh

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8
Q

Ek=

A

1/2 x m x v^2

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9
Q

Ee=

A

1/2 x k x e^2

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10
Q

Elastic potential energy=

A

1/2 x Spring constant x Extension^2

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11
Q

What is useful energy?

A

Energy transferred to where it is wanted in the way that it is wanted

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12
Q

What is wasted energy?

A

Energy that is not usefully transferred

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13
Q

What happens to energy as it dissipates?

A

It becomes less and less useful

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14
Q

What is the input energy?

A

The energy supplied to the device

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15
Q

What is the useful output energy?

A

The useful energy transferred by the device

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16
Q

Efficiency =

A

Useful output energy / total input energy

17
Q

How can you reduce friction between moving parts?

A

Lubricate the moving parts

18
Q

How can you reduce the energy wasted due to the resistance of a wire causing it to get hot?

A

Use wires with as little electrical resistance as possible

19
Q

How can you reduce air resistance?

A

Streamline the shape of moving objects

20
Q

How can you reduce energy wasted from the sound created by machinery?

A

Cut out noise (e.g. tighten loose parts to reduce vibration)

21
Q

What is power?

A

The rate of energy transferred

22
Q

Power =

A

Energy transferred / time taken

GCSE PHYSICS (Improved) (2 decks)

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