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equations Flashcards

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1
Q

What is the equation for efficiency?

A

useful energy(or power) transferred
divided by
total energy supplied

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2
Q

What is the equation for Power?

A

work done
divided by
time

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3
Q

What is the equation for kinetic energy?

A

1/2 x mass x speed(or velocity)squared

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4
Q

What is the equation for work done?

A

work done=force x distance

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5
Q

disntance travelled=

A

average speed x time

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6
Q

acceleration=

A

change in velocity divided by the time taken

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7
Q

force=

A

mass x acceleration

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8
Q

weight=

A

mass x gravitational field strength

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9
Q

momentum=

A

mass x velocity

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10
Q

change in gravitational potential energy=

A

mass x gravitational field strength x change in vertical height

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11
Q

kinetic energy =

A

1/2 x mass x (speed)*2

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12
Q

efficiency=

A

useful energy transferred by the device/total energy supplied to the device

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13
Q

wave speed=

A

frequency x wavelength

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14
Q

wave speed=

A

distance/time

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15
Q

work done=

A

force x distance moved in the direction of the force

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16
Q

power=

A

work done/time taken

17
Q

energy transferred=

A

charge moved x potential difference

18
Q

charge=

A

current x time

19
Q

potential difference=

A

current x resistance

20
Q

second equation for power ?

A

power = energy transferred/time taken

21
Q

electrical power=

A

current x potential difference

22
Q

second electrical power equation

A

electrical power = (current)*2 x resistance

23
Q

density=

A

mass/ volume

24
Q

force exerted on a spring

A

spring constant x extension

25
Q

(final velocity)2 -(initial velocity)2 =

A

2 x acceleration x distance

26
Q

force=

A

change in momentum/time

27
Q

energy transferred=

A

current x potential difference x time

28
Q

force on a conductor at right angels to a magnetic field carrying a current=

A

magnetic flux density x current x length

29
Q

For transformers with 100% efficiency,potential difference across primary coil x current in primary coil=

A

potential difference across secondary coil x current in secondary coil

30
Q

change in thermal energy =

A

mass x specific heat capacity x change in temperature

31
Q

thermal energy for a change of state=

A

mass x specific latent heat

32
Q

energy transferred in stretching=

A

0.5 x spring constant x (extension)*2

physics equations (3 decks)

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