Equations to learn Flashcards
What equation do you use calculate the distance an object has travelled when you have its speed and the time it took?
Distance (m) = average speed (m/s) x time (s)
What is the equation for acceleration?
a = (v-u) divided by time or a = (final velocity - starting velocity) divided by time
What is the equation for force?
Force = mass x acceleration
What is the formula for weight?
W = mass x gravitational field strength (10)
What is gravitational field strength on earth?
10
What is the formula for the change in gravitational potential energy?
GPE = mass (kg) x GFS (N/kg) x change in height (m)
What is the formula for kinetic energy?
Kinetic energy (J) x 0.5 x mass (kg) x speed squared
What is the formula for efficiency?
(useful energy transferred by the device) divided by (total energy supplied by the device) both in J
What is the formula for wave speed when you have the frequency and wavelength?
Wave speed (m/s) = frequency (Hz) x Wavelength (m)
What is the formula for wave speed when you have the distance and time?
Wave speed (m/s) = Distance (m) divided by time
What is the formula for the time for 1 wavelength to travel past a fixed point?
Time period (s) = 1 divided by frequency (Hz)
What is the formula for work done?
Work done (J) = force (N) x distance moved in direction of the force (m)
What is the formula for power?
Power (W) = work done (J) divided by time taken (s)
What is the formula for the movement of a force?
Movement of a force (Nm) = force (N) x perpendicular distance between the line of action of the force and the pivot
What is the formula for energy transferred?
Energy transferred (J) = Power (Watts or KiloWatts) x time (s or h)
What is the formula for electrical power?
Electrical power (W) = Current Squared (A) x Resistance (Omega)
What is the formula for density?
Density (kg/m cubed) = mass (kg) divided by volume (m cubed)
What is the formula for force exerted on a spring?
Force exerted on a spring (N) = Spring constant (N/m) x extension (m)
What is the formula for pressure including force and area?
Pressure (Pa) = Force on a surface (N) divided by area of the surface (m squared)
What is the formula for spring constant?
Spring constant (k) = force (f) divided by extension (x)
What is the formula for stopping distance?
Stopping distance (m) = Reaction distance (m) + Braking Distance (m)
