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Physics > Mr Caseys Flash Cards > Flashcards

Mr Caseys Flash Cards

1
Q

Which energy recourses are renewable?

A

Solar, wind, tidal, wave, geothermal, hydroelectric, biomass

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2
Q

Why are some energy resources more reliable than others?

A

Can generate electricity any time it’s needed

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3
Q

What are the effects on the environment of each energy resource?

A

Could be:Water pollution, visual pollution, habitat damage, radioactive waste

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4
Q

What is the equation for extension?

A

E=mcθ

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5
Q

What are the stores of energy?

A

Kinetic, gravitational, nuclear, elastic, thermal, chemical

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6
Q

Which energy resources are non renewable?

A

Coal, oil, gas, nuclear

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7
Q

What is a system?

A

An object or group of objects

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8
Q

What factors determine the gravitational potential energy of an object?

A

Ep=mgh (mass, gravitational field strength and height

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9
Q

What are the units of energy?

A

Joules(J)

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10
Q

For a spring, how are force, extension and the spring constant linked?

A

F=ke

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11
Q

What does the specific heat capacity of water is 4200J/kg°C mean?

A

Water needs 4200J of energy to increase the temperature of 1kg by 1°C

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12
Q

What are the 9 energy types?

A

Kinetic, heat, light, gravitational potential, chemical, sound, electrical, elastic, nuclear

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13
Q

What are the two laws of energy?

A

Energy cannot be created or destroyed, only transferred. Energy dissipates (spreads out) into less useful forms

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14
Q

How is efficiency calculated, in terms of energy, and power?

A

Useful energy/total energy x100

Useful power/total power x100

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15
Q

How do you calculate the kinetic energy of a moving object?

A

Ek=1/2mv squares

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16
Q

How can unwanted energy transfers be reduced by thermal insulation?

A

Reduced heat energy losses(by conduction, convention, radiation

17
Q

What are the 11 main energy resources on Earth?

A

Coal, oil, gas, solar, wind, tidal, wave, geothermal, hydroelectric, nuclear, biomass

18
Q

What does renewable mean?

A

It can be generated as quickly as it is used

19
Q

What are the effects on the environment of fossil fuels?

A

When burnt…CO2 released into air…which adds to global warming

20
Q

How can unwanted energy transfers be reduced by lubrication?

A

Reduced friction which reduces energy losses as heat

21
Q

What is thermal conductivity?

A

How quickly heat energy is transferred (best in solids and metals)

22
Q

What is power?

A

Rate of energy transfer or doing work

P=E/t

P=W/t

23
Q

How does a force-extension graph change past the limit of proportionality?

A

No longer directly proportional (not a straight line)

Physics (1 decks)

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