1.1.2.2 Total momentum before equals total momentum after
1.1.3 Resolve vectors to solve
momentum in two dimentions
1.2 Force and Energy
1.2.1 Force is the change in momentum
1.2.1.1 F = ma
1.2.1.2 "the rate of change of
momentum of an object is
directly proportional to the
resultant force which acts on
an object"
1.2.1.2.1 F = mv / t
1.2.2 Conservation of Energy
1.2.2.1 Energy cannot be created or Destroyed. Energy can be
transferred from one form to another but the total amount of
energy in a closed system will not change.
1.2.3 Kinetic Energy
1.2.3.1 Ek = 1/2 mv^2
1.2.3.2 Ek = P^2/ 2m
1.2.3.3 Kinetic Energy is conserved
in Elastic collisions
1.3 Circular motion
1.3.1 Radians
1.3.1.1 Angle in Radians = (2¬ / 360) x
angle in degrees
1.3.2 Angular Speed is the angle
an objet rotates per second
1.3.2.1 w = 0 / t
1.3.2.2 v = w r
1.3.3 Frequency and Period
1.3.3.1 f = 1/ T
1.3.3.2 w = 2¬ f
1.3.3.3 T = 2¬ / w
1.3.4 Centripetal Acceleration
1.3.4.1 F = m v^2 / r
1.3.4.2 a = r w
1.3.4.3 a = v^2 / r
1.3.4.4 F = m w^2 r
1.3.4.5 Produced by Centripetal Force
2 Electric and Magnetic Fields
2.1 Electrical Fields
2.1.1 Electric field around a charged object
2.1.2 F = k Q1 Q2/ r^2
2.1.2.1 Force on Q1 is always equal and opposite to Q2
2.1.2.2 k = 1 / 4¬E
2.1.2.2.1 E = permittivity of material
between charges
2.1.3 Radial and Uniform
2.1.4 E= kQ / r^2
2.1.5 E = F / Q
2.1.6 E = V / d
2.2 Capacitors
2.2.1 Amount of charge stored per volt
2.2.1.1 C = Q / V
2.2.2 Charging and Discharging
2.2.2.1 Q = Q0 e^-t/RC
2.2.2.1.1 V = V0 e^-t/RC
2.2.2.1.2 I = I0 e^-t/RC
2.2.2.2 T = RC
2.2.2.2.1 Fully Discharged = 5RC
2.2.3 W = 1/2 QV
2.2.4 W = 1/2 CV^2
2.2.5 W = Q^2 / 2C
2.3 Magnetic Fields and Forces
2.3.1 ∅=BA
2.3.2 ϕ=N∅=BAN
2.3.3 Fleming's left hand rule
2.3.4 F=BIl
2.3.4.1 F = BIl sin Θ
2.3.4.2 The force on one metre of wire carrying a current of one
amp at right angles to the magnetic field
2.4 Charged particles in magnetic fields
2.4.1 F = Bqv
2.4.1.1 F = Bqv sin Θ
2.4.2 Faraday's law
2.4.2.1 The induced e.m.f is directly
proportional to the rate of change
of flux linkage
2.4.2.2 induced e.m.f =∆Φ/∆t
2.4.2.2.1 induced e.m.f = ∆N∅/∆t
2.5 Electromagnetic Induction
2.5.1 Lenz's law, the induced e.m.f is
always in such a direction at to
oppose the change it caused