# BMAT physics

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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?
n1/n2=V1/V2
8. Equation for force?
F=ma
9. Equation for weight?
W=mg
10. Equation for GPE?
GPE=mg∧h
11. Equation for kinetic energy?
• KE=0.5mv²
• KEmax=GPEmax
12. Equation for work done?
E=Fd
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?
density=mass/volume
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
• 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