Equations Flashcards
What is the equation for work done?
Work done (J) = force applied (N) x distance (M)
What is the equation for gravitational potential energy?
Gravitational potential energy (J) = mass (kg) x gravitational field strength (N/kg) x height (m)
What is the equation for kinetic energy?
Kinetic energy (J) = 1/2 x mass (kg) x velocity^2 (m/s)
What is the equation for elastic potential energy?
Elastic potential energy (J) = 1/2 x spring constant (N/m) x extension^2 (m)
What is the equation for efficiency?
Useful output energy (J) / total input energy (J)
What is the equation for power relating to energy and time?
Power (W) = energy transferred (J) / time taken (s)
What is the equation for wasted power?
Power wasted = total power in - useful power out
What is the equation for specific heat capacity?
Energy transferred (J) = mass (kg) x specific heat capacity (J/kg degrees C) x temperature change (degrees C)
What is the equation involving voltage, energy transferred and charge?
Potential difference (V) = energy transferred (J) / charge (Q)
What is the equation for resistance?
Resistance (ohms) = potential difference (V) / Current (A)
What is the equation for resistance in a series?
Total resistance = sum of resistance of all components
What is the equation for current?
Current (A) = potential difference (V) / component resistance (ohms)
What is the equation linking power, current and voltage?
Power (W) = Current (A) x Potential difference (V)
What is the equation linking power, current and resistance?
Power (W) = current^2 (A) x resistance (ohms)
What is the equation linking charge and current?
Charge flow (C) = Current (A) x time (s)
What is the equation for density?
Density (kg/m3) = mass (kg) / volume (m3)
What is the equation for latent heat?
Specific latent heat of fusion/vapourisation (J/kg) = energy (J) / mass (kg)
What is the equation for Boyle’s Law?
Pressure (Pa) x volume (m3) = constant
What is the equation for moments of forces?
Moment (Nm) = Force (N) x perpendicular distance from the line of action of the force to the pivot (m)
What is the principle of moments?
The sum of all clockwise moments = The sum of all anticlockwise moments
What is the equation for speed?
Speed (m/s) = distance (m) / time (s)
What is the equation for acceleration?
Acceleration (m/s) = change in velocity (m/s) / time taken (s)
What is the equation for resultant force?
Resultant force (N) = mass (kg) x acceleration (m/s^2)
What is the equation for inertia?
Inertial mass = force / acceleration
What is the equation for weight?
Weight (N) = mass (kg) x gravitational field strength (N/kg)
What is stopping distance?
Stopping distance = thinking distance + braking distance
What is the equation for momentum?
Momentum (kg m/s) = mass (kg) x velocity (m/s)
What is the equation for force using mass, change in velocity and time taken?
Force (N) = (mass (kg) x change in velocity (m/s)) / time taken (s)
What is the equation for Hooke’s Law?
Force applied (N) = spring constant (N/m) x extension (m)
What is the equation for density in a liquid?
Pressure (Pa) = height (m) x density (kg/m3) x gravitational field strength (N/kg)
