P1: Conservation/dissipation of energy Flashcards

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1
Q

What are the energy stores

A

Kinetic
Grav Potential
Elastic
Chemical
Electrostatic
Magnetic
Light
Internal

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2
Q

What are the energy transfers

A

Radiation
Thermal
Electrical
Mechanical

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3
Q

What is the Conservation of Energy

A

Energy cannot be created or destroyed, we can only transfer

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4
Q

What is the equation for kinetic energy

A

0.5 x Mass x Velocity squared

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5
Q

What is the equation for grav potential energy

A

mass x height x grav field strength

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6
Q

What is the equation for elastic energy

A

0.5 x Spring constant x Extension squared

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7
Q

What is energy measured in

A

Joules

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8
Q

What is the equation for thermal energy

A

Mass x Specific heat capacity x Temperature Change

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9
Q

What is efficiency

A

How good a device is at transferring energy input to useful energy output

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10
Q

How do we work out efficiency

A

Useful energy output/Total energy input

Multiply by 100 if you want a percentage

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11
Q

What is power

A

The rate of doing work

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12
Q

How do we work out power

A

Energy/Time

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13
Q

What is power measured in

A

Watts

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14
Q

What is time measured in

A

Seconds

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15
Q

What is mass measured in

A

Kilograms

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16
Q

What is velocity measured in

A

Metres per second
m/s

17
Q

What is height measured in

A

Metres

18
Q

What is gravitational field strength measured in

A

N/Kg
Newtons per kilogram

19
Q

What is extension measured in

A

Metres

20
Q

What is spring constant measured in

A

N/m
Newtons per metre

21
Q

What is temperature change measured in

A

Degrees Celsius

22
Q

What is specific heat capacity measured in

A

J/Kg 0 C
Joules per kilogram degrees Celsius