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Physics > Energy P1 > Flashcards

Energy P1 Flashcards

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1
Q

Equation for kinetic energy

A

Kinetic energy =1/2 x mass x speed squared

Ek=1/2mv squared

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2
Q

Equation for GPE

A

GPE= mass x gravitational field strength x height

Ep=mgh

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3
Q

Equation for power

A

Power=work done/time taken. = energy transferred/time taken

P= W/t =E/t

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4
Q

Equation for efficiency

A

Efficiency = useful energy output/total energy input

Efficiency =useful power output / total power input

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5
Q

What is kinetic energy

A

The energy an object has because it is moving

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6
Q

What is GPE

A

The energy an object has because of its position

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7
Q

What is elastic potential energy

A

The energy stored in a springy object when u stretch or squash ut

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8
Q

What is thermal energy

A

The energy a substance has because of its temp

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9
Q

What is chemical energy

A

The energy stored in fuels foods snd batteries

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10
Q

What is conservation of enrrgy

A

Energy can not be created or destroyed only transferred

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11
Q

What is work done

A

The force applied to an object to move it a distance

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12
Q

What is dissipation

A

The process of energy being transferred or lost to the surroundings

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13
Q

What is friction

A

A force that opposes movement

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14
Q

What is a system

A

And object or a group of objects

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15
Q

What is useful energy

A

Energy in the place it is wanted and in the form it is needed in

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16
Q

What is a closed system

A

An isolated system where no energy transfers take place into or out of the energy stored in the system

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17
Q

What is wasted energy

A

Energy that is not usefully transferred. Usually as thermal

18
Q

Name 4 ways energy is transferred

A

Heating waves electric current force when it moves an object

19
Q

Describe what happens to a falling object

A

Decreases its gpe stores. Increases its ke stores as it falls. Waste energy transferred as thermal or sound

20
Q

Equation for elastic potential energy

A

1/2 x spring constant (k) x extention squared

21
Q

Equation for work done

A

Force applied x distance moved

22
Q

What is the equation for spring constanr

A

Force/ extension

23
Q

What does poportional mean

A

When one increases the other also increases

24
Q

Equation for thermal energy

A

Energy=mass x SHC x temp chnage
C= delta E /m x delta fita

25
Q

What is a systematic error

A

Error in ur method

26
Q

What is a random error

A

An error that is different everytime

27
Q

Name some errors

A

Zero error Reading thermometer wrong

28
Q

Energy to do with heater

A

Energy=power of heater x time

29
Q

How many joules are in a kilojoule

A

1000

30
Q

What is covection

A

Heat transfer in fluids

31
Q

What is conduction

A

Heat transfer thru direct contact of materials

32
Q

What does high conductivity mean

A

High energy flow

33
Q

Why is double insulating windows good

A

Bc both glass and air have low thermal conductivity compared to other materials such as copper. Low energy flow. The temp inside wont espace house. Less heat transferred per second

34
Q

What is shc

A

How much energy ut takes to raise 1kg of a substance by 1 degree celcius

35
Q

What does renewable energy mean

A

The resources can replenish faster than it is being used. It is an infinite resource.

36
Q

Why is air a bad conductor of heat

A

Bc it has a high shc snd the particles r spaced out

37
Q

What is nuclear energy

A

The forces acting between atomic nuclei

38
Q

What is magnetic energy

A

The energy something with a magnetic field has

39
Q

What is elctrostatic energy

A

The forces acting between charges

40
Q

What is equation for speed

A

Speed=distance/time

Physics (3 decks)

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