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A2 Physics
Unit 4
- Further Mechanics
- Momentum
- Momentum = Mass x Velocity
- P (kg ms-1) = m (kg) x v (ms-1)
- P (kg ms-1) = m (kg) x v (ms-1)
- Momentum is ALWAYS conserved
- Assuming no external forces
- Total momentum before equals total momentum after
- Assuming no external forces
- Resolve vectors to solve
momentum in two dimentions
- Momentum = Mass x Velocity
- Force and Energy
- Force is the change in momentum
- F = ma
- "the rate of change of
momentum of an object is
directly proportional to the
resultant force which acts on
an object"
- F = mv / t
- F = mv / t
- F = ma
- Conservation of Energy
- 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.
- 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.
- Kinetic Energy
- Ek = 1/2 mv^2
- Ek = P^2/ 2m
- Kinetic Energy is conserved
in Elastic collisions
- Ek = 1/2 mv^2
- Force is the change in momentum
- Circular motion
- Radians
- Angle in Radians = (2¬ / 360) x
angle in degrees
- Angle in Radians = (2¬ / 360) x
angle in degrees
- Angular Speed is the angle
an objet rotates per second
- w = 0 / t
- v = w r
- w = 0 / t
- Frequency and Period
- f = 1/ T
- w = 2¬ f
- T = 2¬ / w
- f = 1/ T
- Centripetal Acceleration
- F = m v^2 / r
- a = r w
- a = v^2 / r
- F = m w^2 r
- Produced by Centripetal Force
- F = m v^2 / r
- Radians
- Momentum
- Electric and Magnetic Fields
- Electrical Fields
- Electric field around a charged object
- F = k Q1 Q2/ r^2
- Force on Q1 is always equal and opposite to Q2
- k = 1 / 4¬E
- E = permittivity of material
between charges
- E = permittivity of material
between charges
- Force on Q1 is always equal and opposite to Q2
- Radial and Uniform
- E= kQ / r^2
- E = F / Q
- E = V / d
- Electric field around a charged object
- Capacitors
- Amount of charge stored per volt
- C = Q / V
- C = Q / V
- Charging and Discharging
- Q = Q0 e^-t/RC
- V = V0 e^-t/RC
- I = I0 e^-t/RC
- V = V0 e^-t/RC
- T = RC
- Fully Discharged = 5RC
- Fully Discharged = 5RC
- Q = Q0 e^-t/RC
- W = 1/2 QV
- W = 1/2 CV^2
- W = Q^2 / 2C
- Amount of charge stored per volt
- Magnetic Fields and Forces
- ∅=BA
- ϕ=N∅=BAN
- Fleming's left hand rule
- F=BIl
- F = BIl sin Θ
- The force on one metre of wire carrying a current of one
amp at right angles to the magnetic field
- F = BIl sin Θ
- ∅=BA
- Charged particles in magnetic fields
- F = Bqv
- F = Bqv sin Θ
- F = Bqv sin Θ
- Faraday's law
- The induced e.m.f is directly
proportional to the rate of change
of flux linkage
- induced e.m.f =∆Φ/∆t
- induced e.m.f = ∆N∅/∆t
- induced e.m.f = ∆N∅/∆t
- The induced e.m.f is directly
proportional to the rate of change
of flux linkage
- F = Bqv
- Electromagnetic Induction
- Lenz's law, the induced e.m.f is
always in such a direction at to
oppose the change it caused
- induced e.m.f = -∆N∅/∆t
- induced e.m.f = -∆N∅/∆t
- Transformers
- Lenz's law, the induced e.m.f is
always in such a direction at to
oppose the change it caused
- Electrical Fields
- Particle Physics
- The Nuclear Atom
- Particle Accelerators
- Classification of Particles
- Antiparticles
- Quarks
- Detecting particles
- The Nuclear Atom
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