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GCSE Physics > Energy Transfers and Equations > Flashcards

Energy Transfers and Equations Flashcards

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1
Q

Kinetic Energy Equation

A

KE=1/2mv²
KE = 1/2 x mass x speed²

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2
Q

Gravitational Potential Energy Equation

A

GPE=mgh
GPE= mass x gravitational field strength x height

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3
Q

Work Done Equation

A

Ew=Fd
Work Done= Force x Distance

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4
Q

Energy Equation

A

E=Pt
Energy = Power x Time

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5
Q

Efficiency Equation

A

Efficiency=Useful output/Total input

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6
Q

Speed Equation

A

v=d/t
Speed=Distance/Time

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7
Q

Weight Equation

A

W=mg
Weight = mass x gravitational field strength

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8
Q

KE and GPE

A

KE at bottom = GPE at top
1/2mv² (bottom)= mgh (top)

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9
Q

Final speed of falling object Equation

A

v²=2gh

Speed²=2 x gravitational field strength x height

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10
Q

What are the units for mass (m)?

A

Kilograms (Kg)

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11
Q

What are the units for time (t)?

A

Seconds (s)

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12
Q

What are the units for distance (d)?

A

Metres (m)

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13
Q

What are the units for height (h)?

A

Metres (m)

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14
Q

What are the units for speed (v)?

A

Metres per second (m/s)

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15
Q

What are the units for force (F)?

A

Newtons (N)

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16
Q

What are the units for weight (W)?

A

Newtons (N)

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17
Q

What are the units for energy (E)?

A

Joules (J)

18
Q

What are the units for Gravitational Potential Energy (GPE)?

A

Joules (J)

19
Q

What are the units for Kinetic Energy (KE)?

A

Joules (J)

20
Q

What are the units for Work Done (Ew)?

A

Joules (J)

21
Q

What are the units for power (P)?

A

Watts (W)

22
Q

What are the units for Gravitational field strength (g)?

A

Newtons per kilogram (N/Kg)

23
Q

What are the units for Efficiency?

A

None or %
Eg. 0.5=50%

24
Q

Law of conservation of energy

A

Energy cannot be created or destroyed, only transferred or stored.

25
Q

What are the seven energy stores?

A
  • Magnetic
  • Thermal
  • Kinetic
  • Gravitational Potential
  • Chemical
  • Electrostatic
  • Elastic Potential
26
Q

What is the magnetic energy store?

A

Magnets that are attracting or repelling.

27
Q

What is the thermal energy store?

A

The higher the temperature, the higher the energy store

28
Q

What is the kinetic energy store?

A

Anything that is moving

29
Q

What is the elastic potential energy store?

A

Anything that has been stretched

30
Q

What is the gravitational potential energy store?

A

Anything in a gravitational field (anything that can fall)

31
Q

What is the electrostatic energy store?

A

Two electric charges that attract or repel

32
Q

What is the chemical energy store?

A

An object/ substance from which energy can be released by a chemical reaction

33
Q

What are the four ways to transfer energy?

A
  • Mechanically
  • Electrically
  • Thermally
  • Radiating
34
Q

How can you transfer energy mechanically?

A
  • As a result of forces
  • Energy transferred = force x distance
35
Q

How can you transfer energy electrically?

A
  • By flowing electrons in wires
  • Energy transferred = voltage x charge
36
Q

How can you transfer energy thermally?

A
  • As a result of temperature difference
  • By conduction, convection or radiation
37
Q

How can you transfer energy by radiating?

A
  • By light or sound waves
38
Q

What does a Sankey diagram show?

A

The efficiency of specific energy transfers

39
Q

In a Sankey diagram, which value is in the arrow that is straight and at the top?

A

Useful output

40
Q

Do you draw a Sankey diagram to scale?

A

Yes

41
Q

In a Sankey diagram, which value is in the arrow that is at the bottom and bent?

A

The wasted output

42
Q

In a Sankey diagram, what value goes on the left on the straight edge?

A

The total input

GCSE Physics (10 decks)

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