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GCSE Physics > P1 - Conservation and Dissipation of Energy > Flashcards

P1 - Conservation and Dissipation of Energy Flashcards

1
Q

What is Energy measured in?

A

Joules (J)

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2
Q

Which systems can a thermodynamic system be in?

A

An open system
A closed system
An isolated system

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3
Q

What is the Law of Conservation of Energy

A

Energy cannot be created or destroyed, it can only be tranferred from one store to another

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4
Q

What

A
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5
Q

How is energy tranferred between stores?

A

Through pathways

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6
Q

What are examples of energy transfer pathways?

A

Mechanically
Electrically
Be heating
By radiation

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7
Q

What does a mechanical pathway mean?

A

Energy transfer when a force acts on an object

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8
Q

What does an electrical pathway mean?

A

Energy transfer when a chrage moves through a current

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9
Q

What does a ‘by heating’ pathway mean?

A

Energy transfer from a hotter object to an colder one

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10
Q

What does a ‘by radiation’ pathway mean?

A

Energy transfer by electromagnetic waves e.g. visible light

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11
Q

Where is Kinetic Energy store found?

A

In a moving object

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12
Q

Where Where is Chemical Energy store found?

A

Found in a fuel or battery

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13
Q

Where is Gravitational Potential Energy store found?

A

In an object above ground

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14
Q

Where is Elastic/ Strain Energy store found?

A

In a strethced or squashed object

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15
Q

Where is Thermal Energy store found?

A

In a substances temperature

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16
Q

Where is Magnetic Energy store found?

A

In two seperate magnets that attract or repel

17
Q

Where is Nuclear Energy store found?

A

Radioactive decay

18
Q

What are some examples of energy transfers through waves?

A

Light waves
Infra-red radiation (heat)
Sound waves

19
Q

What is a Pendulum?

A

a body suspended from a fixed point so that it can swing back and forth under the influence of gravity

20
Q

Explain the conservation of energy stores in a Pendulum.

A

As the Pendulum moves to the middle, G.P.E. is transferred ,by the force of gravity, to K.E.
G.P.E. decreases as the K.E. increases
As the Pendulum moves past the middle, K.E. Decreases and its G.P.E increases

This process is repeated

21
Q

Why cant a Pendulum return to its initial starting height?

A

Due to air resistance, some energy is transferred to the surroundings
Therefore not all energy is transferred between the g.p.e. and k.e. Stores

22
Q

What is The Law of The Conservation of Energy?

A

Energy cannot be created nor destroyed, only tranformed from one form to another

23
Q

What would a closed system look like in terms of a Pendulum experiment?

A

No energy is transferred out the Pendulum system so it WONT MOVE

24
Q

What does ‘work’ mean in physics?

A

To move an object with an applied force

25
Q

What is the equation for work done?

A

Work = force x distance

26
Q

What is the equation for gravitational potential energy?

A

G.P.E = mass x gravitational field strengthx change in height

27
Q

What is the equation for Kinetic Energy?

A

1/2 x mass x velocity°2

28
Q

What is useful energy?

A

Energy that is transferred to where it is wanted and form it is wanted in

29
Q

What is wasted energy?

A

Energy that is not usefully transferred

30
Q

What is the equation for efficiency?

A

Efficiency = useful energy out/total energy supplied in X 100

31
Q

What does it mean to ‘power a device’?

A

To supply a device with mechanical or electrical energy

32
Q

What is ‘Power’ in physics?

A

The rate at which energy is transferred

33
Q

What is Power measured in?

A

Watts, W

34
Q

What does 1 Watt equal to?

A

1 Joule / s

35
Q

What is the equation for power?

A

Power = energy / time

36
Q

How do you calculate power wasted?

A

Power wasted = total power in - useful power out

GCSE Physics (7 decks)

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