physics formulas Flashcards by Tan Yee

Q

average speed

A

v = total distance/total time

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Q

acceleration

A

a= final velocity-initial velocity / time

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Q

distance

A

area under speed-time graph

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Q

acceleration of free fall

A

a=10m/s2

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Q

gravitational field strength

A

g=10N/kg

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Q

weight

A

W=mg

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Q

density

A

density=mass/volume

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Q

pressure

A

pressure=force/area

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Q

resultant force

A

f=ma

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Q

work done

A

W=Fd

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Q

kinetic energy

A

Ek=1/2 mv2

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Q

gravitational potential energy

A

Ep=mgh

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Q

power

A

P=E/T

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Q

moment of a force about a point

A

moment=force x perpendicular distance

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Q

wave speed

A

v=f x λ

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Q

speed of sound by direct measurement

A

v=d/t

Q

speed of sound by echo

A

v=2d/t

Q

refractive index(angle)

A

n=sin i/sin r

Q

refractive index(speed)

A

n=speed of light in vacuum/speed of light in medium

Q

current

A

I=Q/t

Q

charge

A

Q=I x t

Q

emf

A

E=W/Q

Q

potential difference

A

V=W/Q

Q

resistance

A

R=V/I

Q

effective resistance (in series)

A

R=R1+R2+R3

Q

effective resistance (in parallel)

A

1/R = 1/R1 + 1/R2 +1/R3

Q

electric power

A

P=I x V

Q

electrical energy

A

E=P x t

Q

cost of energy

A

cost= E x unit cost
1kW=1000W
1h=60 x 60s
1h=60 min