Formulas Flashcards
Average Speed
Average Speed = Distance/Time
Average Velocity
Average Velocity = Displacement/Time
Acceleration
Acceleration = Final velocity - Initial Velocity/Time
Work
Work = Force x Distance moved
Power
Power = Work/Time
Gravitational Potential Energy
GPE = Mass x Gravity x Height
Efficiency
Efficiency = useful power output/total power input x 100
Efficiency = useful ENERGY output/total energy input x 100
Current
Current = Charge/Time
Power
Power = Current x Voltage
Resistors in series
Resistors in series : Total Resistance = R1 + R2…
Resistors in parallel
Resistors in parallel: 1/R1 + 1/R2…
Resistance
Resistance = Resistivity x Length/Area
Potential difference
P.d (joules per coulomb) = E/Q
Pressure and forces
F = P x A
Force
F = Mass x Acceleration
Amount of volts In resistor
V = IR
Impulse
Impulse - Force x Time
Optical wire
Total internal reflection occurs when the angle of incidence of light is larger than the critical angle. The incident material is denser than the second material.
Total internal reflection is used to reflect light along optical fibres, meaning they can be used for
- Endoscopes
- Decorative lamps
Light travelling down an optical fibre is totally internally reflected each time it hits the edge of the fibre
