Formulae - Physics
FORMULAE Making measurements density = mass/volume (g/cm3) Describing Motion average speed = total distance travelled/total time taken (m/s) speed = distance/time (m/s) acceleration = change in velocity/time taken (m/s) acceleration = new speed - old speed/time taken Forces and Motion gravitational field strength = weight/mass (N/kg) weight = mass * gravity (N) force = mass * acceleration (N/m) momentum = mass * velocity (kg m/s) impulse = force * time (Ns) resultant force = change in momentum/unit time (N) Turning effects of forces moment of a force = force * perpendicular distance from the pivot (Nm) Forces and matter Force = constant(k) * extention(x) spring constant = force/unit extension pressure = force/area (N/m2 or pascals) change in pressure = density * gravity * depth (pascals) Energy stores and transfers Efficiency = useful energy output/total energy input(*100 for percentage) change in g.p.e = weight * change in height Kinetic energy = 1/2 * mass * speed^2 hello beta...