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Physics > Energy > Flashcards

Energy Flashcards

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1
Q

What is significant about energy?

A

It can’t be created or destroyed, only transferred between stores

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2
Q

What are the 7 energy stores?

A

Kinetic, chemical, thermal, gravitational, elastic, nuclear, electromagnetic

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3
Q

What are the 4 energy pathways?

A

mechanically, electrical, heating, radiation

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4
Q

what is work done?

A

the energy transferred when a force moves an object through distance

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5
Q

work done equation?

A

W=Fs

J=Nxm

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6
Q

Gravitational potential equation

A

Eg=mgh

J=KgxN/Kgxm

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7
Q

Kinetic store equation

A

Ek=(mv*2)/2

J=Kg m/s

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8
Q

Elastic potential energy equation

A

Ee=(Ke*2)/2

J=N/m m

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9
Q

power equation

A

P=E/t

W= J/s

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10
Q

what is the rate of energy transfer?

A

How much energy is being transferred per second

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11
Q

Efficiency equation

A

Efficiency=useful energy/total energy input x100

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12
Q

what is conduction?

A

energy transfer by heating where vibrating particles transfer energy to neighbouring particles. slg

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13
Q

What in convection?

A

when gases and liquids are heated the particles move faster and the spaces increase making it less dense

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14
Q

electrical energy transfer equation

A

current x potential x time difference

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15
Q

What is a system

A

an object or group of objects

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16
Q

what happens when an object is projected upwards

A

Kinetic energy to gravitational

17
Q

what happens when a moving object hits an obstacle

A

kinetic store to the thermal store

18
Q

what happens to the energy when an object accelerates at a constant force

A

chemical store to kinetic store

19
Q

what happens to energy when an vehicle slows down

A

kinetic to chemical

20
Q

what happens to energy when boiling a kettle

A

thermal energy of heater goes to thermal store of water

21
Q

what is specific heat capacity

A

the amount of energy required to raise temperature of 1 kg of a substance by 1 degree

Physics (10 decks)

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