Know it! Flashcards
Word equation to show the relationship between average speed, distance moved and time taken
average speed = distance moved/ time taken
Equation to show how acceleration is calculated from the change in speed
acceleration = change in velocity/time taken
a = (v - u)/t
Suvat equation to show relationship between v, u , a and s
v² = u² + (2 x a x s)
(final speed)² = (initial speed)² + (2 x acceleration x distance moved)
Equation to show the relationship between acceleration, unbalanced (resultant) force, and mass
force = mass x acceleration
F = m x a
Equation to show how the weight of an object depends on its mass and the gravitational field strength
weight = mass x gravitational field strength
W = m x g
Total stopping distance equation
Total stopping distance = thinking distance + braking distance
Equation to show the relationship between the Force acting on an object, the change in momentum due to that force and the time for which the force acts
force = change in momentum/time taken
F = (mv - mu)/t
Define the momentum of an object
momentum = mass x velocity
p = m x v
Equation to show the relationship between the moment of a force and its perpendicular distance from the pivot
moment = force x perpendicular distance from the pivot
Equation to show the relationship between efficiency, useful energy output and total energy input
efficiency = useful energy output/total energy input x 100%
Equation to show the relationship between gravitational potential energy, mass, gravitational field strength and height
gravitation potential energy = mass x gravitational field strength x height
GPE = m x g x h
Equation to show the relationship between work done, force and distance
work done = force x distance moved
W = F x d
Equation used to calculate the kinetic energy of an object
kinetic energy = 1/2 x mass x speed²
KE = 1/2 x m x v²
Equation used to show the relationship between power, work done and time taken
power = work done/time taken
P = W/t
Equation used to calculate the pressure exerted by a force on a solid object/surface
pressure = force/area
p = F/A
Equation used to calculate the density of an object
density = mass/volume
ρ = m/v
Equation used to show the relationship between power, energy transferred, and time taken
Power = energy transferred/time
P = E/t
Equation to calculate the pressure exerted by a liquid/gas
pressure difference = height x density x gravitational field strength
p = h x ρ x g
