BMAT physics

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BMAT physics
2015-11-01 13:29:54
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  1. Equation for charge?
    • Q=It(s)
    • It is the flow of electrons
    • Q=coulombs
  2. Equation for current?
    • V=IR
    • I=V/R
    • I=amps
    • It is the rate of flow of charge
  3. Equation for voltage/potential difference?
    • V=IR
    • V=volts
    • It is the work done per unit charge 1J/c
  4. Equation for energy?
    • E=QV
    • E=ItV
    • E=energy
    • measured in joules
  5. Equation for power?
    • P=IV
    • P=E/T
    • P=I²R
    • P=V²/R
    • P=watts
    • It is the change in energy over the change it time
  6. Equation for resistance?
    • V=IR
    • R=resistance
    • units = ohms
    • It is the impotence to the flow of charge
  7. Equation for coils?
  8. Equation for force?
  9. Equation for weight?
  10. Equation for GPE?
  11. Equation for kinetic energy?
    • KE=0.5mv²
    • KEmax=GPEmax
  12. Equation for work done?
  13. Values for quantity
    • Kilo= x10³
    • Mega= x
    • Giga=x
    • Mili=x
    • Micro=x
    • Nano=x
  14. Circuit symbols
    • Current flows from big stick of cell to little stick.
    • A diode monitors the direction of flow.
    • Transformers are used to step up or down voltage.
  15. What types of radiation are there?
    alpha, beta, gamma
  16. How far does radiation travel?
    • alpha= up to 10cm, highly ionising, blocked by paper
    • beta= up to 1m, mid ionising, blocked by aluminium
    • gamma=infinity, least ionizing, blocked by thick lead
  17. What are the masses of different radiation?
    • alpha= mass of 4, 2 protons and 2 neutrons
    • beta= mass of 0, charge of -1
    • gamma= nothing, nucleus just changes from high energy to low energy
  18. What is half life?
    The average time taken for half the isotopes/number of nuclei to decay
  19. Equation for density?
  20. Efficiency?
    Eff=useful energy out/total energy in
  21. What is amplitude, wavelength and frequency?
  22. Wave speed equation?
    wave speed(ms-1)=wavelength(m) x frequency(Hz)
  23. Series and parallel circuits
  24. Rules for cells in circuits.
    • When cells connected in series, total voltage = sum of individual voltages.
    • When cells connected in parallel, total voltage = voltage of just one cell.
  25. Rules for resistors in circuits.
    • When resistors in series, resistance is added up.
    • When resistance in parallel, the total resistance is less than of an individual resistor.
    • Resistors always have same resistance, unless temperature is changed.
  26. Calculating resistance in parallel.
    • Method 1- 3+ resistors
    • Rt = total resistance
    • Method 2- 2 resistors
    • resistance=product/sum
    • (two R multiplied/two R added)
    • Method 3- any number of identical resistors
    • resistance of a single one ÷ total num of resistors.
  27. Current in circuits.
    • In a parallel circuit, current splits.
    • In a series circuit, current is constant.
  28. Voltage in circuits.
    • In series, total voltage supplied is divided between components.
    • Ratio of voltage = ratio of resistance
    • In parallel,voltage supplied is the same in each component.
  29. Short circuits
    • Charge prefers the path with least resistance.
    • Current will prefer to flow through a wire rather than a bulb if given the option.
  30. Equations for speed and acceleration.
    • speed=distance/time
    • acceleration=change in velocity/time
    • distance-time graph grad=speed
    • velocity-time graph grad=acceleration
    • area under v-t graph = distance
  31. Equation for pressure?
    • P=F/A
    • force (N)/area (m²)
  32. Momentum equation?
    • p=mv
    • p=momentum (kg m/s)
    • m=mass (kg)
    • v= velocity (ms)
  33. Changes in momentum
    • F(N)=change in momentum (kgm/s)/time(s)
    • F=mv-mu/t
  34. Background radiation
    • A low level of radiation thats always there.
    • Make sure to take this into account
  35. Refraction
    • When light is refracted, its wavelength changes, but frequency stays the same.
    • Refraction is the bending of a wave when it enters a medium with different speed.
    • When light travels into denser material=bends towards the normal
    • When light travels into less dense material=bends away from the normal
    • Light of a lower wavelength gets refracted more than light of a higher wavelength.