Unit 4 physics equations

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Momentum
p=mv (kgms^-1)
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Resultant force
F=ma (N)
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Kinetic energy
Ek=(1/2)mv^2 (J)
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Kinetic energy in terms of momentum
Ek=p^2/2m (J)
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Angle in radians from degrees
angle in radians=(2pi/360) x angle in degrees (rad)
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Angular speed
w=angle/time (rads^-1)
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Linear speed
v=wr (ms-1) *r is radius
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Frequency and period (3 equations)
f=1/T or w=2pif or T=2pi/w (f in s-1, T in s)
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Centripetal acceleration (two equations)
a=v^2/r or a=rw^2 (ms^-2)
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Centripetal force (two equations)
F=mv^2/r or F=mw^2r (J)
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Coulomb's law
F=kQ1Q2/r^2 where k=1/4(pi)(epsilon) (J)
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Electric field strength
E=F/Q (NC^-1)
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Electric field strength in a radial field
E=kQ/r^2 where k=1/4(pi)(epsilon) (NC^-1)
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Electric field strength in a uniform field
E=V/d (NC^-1)
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Capacitance
C=Q/V (F)
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Work done by a capacitor
W=(1/2)QV (J)
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Energy stored by a capacitor (3 equations)
W=(1/2)QV or W=1/2CV^2 or W=Q^2/2C (J)
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Charge left on the plates of a capacitor discharging from full
Q=Qoe^(-t/RC) (C) RC=time constant.
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Magnetic fiux
phi=BA where B is the magnetic field and A is the area (Wb)
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Magnetic flux linkage
PHI=Nphi=BAN (Wb)
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Magnetic force
F=BIlsin(angle) (N) l is the length of wire
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Force acting on a sigle charged particle moving in a magnetic field
F=Bqvsin(angle) (N) where q is charge and v is velocity
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Faraday's law
induced e.m.f = dPHI/dt = d(phiN)/dt (V)
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Lenze's law (and Faraday's)
induced e.m.f= d(Nphi)/dt (V)
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de Broglie equation
lambda=h/p where p is momentum (m)
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Radius of a charged particle's curved track
r=p/BQ (m)
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Card 2

Front

Resultant force

Back

F=ma (N)

Card 3

Front

Kinetic energy

Back

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Card 4

Front

Kinetic energy in terms of momentum

Back

Preview of the front of card 4

Card 5

Front

Angle in radians from degrees

Back

Preview of the front of card 5
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