Word equations Flashcards by Alex Cluley

Q

Kinetic energy

A

0.5 x mass x (speed)²

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Q

Gravitational potential energy

A

Mass x gravitational field strength x height

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Q

Power… (energy)

A

Energy transfered / time

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Q

Power… (work done)

A

Work done / time

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Q

Efficiency… (energy)

A

Useful output energy transfer / total input energy transfer

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Q

Efficiency… (power)

A

Useful power output / total power output

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Q

Charge flow

A

Current x time

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Q

Potential difference

A

Current x resistance

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Q

Power…(Potential difference)

A

Potential difference x current

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Q

Power… (Current)

A

(Current)² x resistance

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Q

Energy transfered… (power)

A

Power x time

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Q

Energy transfered… (charge flow)

A

Charge flow x potential difference

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Q

Density

A

Mass / volume

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Q

Weight

A

Mass x gravitational field strength

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Q

Work done

A

Force x distance (along the line of action of force)

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Q

Force… (spring)

A

Spring constant x extention

Q

Moment of a force

A

Force x distance (normal to direction of force)

Q

Pressure

A

Force normal to a surface / area of that surface

Q

Accelaration

A

Change in velocity / time taken

Q

Distance travelled

A

Speed x time

Q

Resultant force

A

Mass x accelaration

Q

Momentum

A

Mass x velocity

Q

Wave speed

A

Frequency x wave length