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physics yr9 > conservation and dissipation of energy > Flashcards

conservation and dissipation of energy Flashcards

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1
Q

what is chemical energy?

A

energy transferred during chemical reactions

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2
Q

What is kinetic energy?

A

energy an object has beacsue it is moving

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3
Q

what is gravitattional potential energy?

A

Energy stored an object has due to its position above the Earth’s surface.

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4
Q

what is elastic potential energy?

A

Energy stored in stretched or compressed objects

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5
Q

What is nucleur energy?

A

Energy stored in the nucleus of an atom

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6
Q

What is eletrical energy?

A

Energy of moving electrons

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7
Q

What is light energy?

A

Energy of electromagnetic waves

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8
Q

how is energy transferred?

A

by eletric current or force or waves

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9
Q

What are the rules of energy?

A

energy cannot be created or destroyed only trasnaferred.

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10
Q

What is work done?

A

amount of energy transferred from an object

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11
Q

What is the equasion for work done?

A

w = force applied x distance moved
( j) ( n) ( m)

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12
Q

What is the equasion for the change in gravitational potential energy?

A

weight x change of height
( n) ( m)

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13
Q

When does the gravitational potential energy store of an object increase?

A

increases when it moves up and decreases when it moves down.

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14
Q

What is the equasion for kinetic energy?

A

kinetic energy
= 1/2 x mass x speed(squared)
(kg) (m/s)

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15
Q

What is the equation to calculate elastic potential energy?

A

elastic potential energy = 1/2 x spring constant(n/m) x
extension(squared)
(m squared)

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16
Q

What is useful energy?

A

energy which is required for an object to work.

17
Q

What is wasted energy?

A

energy that is not usefully transferred.

18
Q

What happens when energy dissipates?

A

it gets less useful

19
Q

how to work out the efficinecy of a device?

A

useful energy transferred by device (j)/ total energy supplied to the device (x 100%)

20
Q

How to work out input energy?

A

useful output energy + energy wasted

21
Q

Can eletrical appliances transfer energy?

A

yes in the form of useful energy at the flick of a switch.

22
Q

What is the equation for power?

A

energy trasnferred to appliance (j) /

time take for energy to be trasnferred (s)

23
Q

What is power?

A

energy transformed or transferred per second. (watts)

24
Q

What is the equation for power wasted by an appliance?

A

total power input - useful power output

25
Q

What is energy dissipation?

A

ways in which energy is wasted

26
Q
A

physics yr9 (1 decks)

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