Physics - Unit 2: Mechanics - 2.2 Force & 2.3 Momentum & 2.4 Work, Energy and Power

(unfinished)

weight (w)(N) =

mass (m)(kg) x gravitational field strength (g)(N kg-1)

Fnet (resultant (net) force) =

mass (m) x acceleration (a)

Hooke’s Law | Force (F)(N) =

spring constant (k)(N m-1) x amount of extension (𝑥)(m)

Circular Motion | Centripetal Force (F)(N) =

(mass (m)(kg) x velocity (v)(ms-1)) / r

Moment of a force (Torque) (τ)(N m) =

Force (F)(N) x perpendicular distance from the pivot (m)

Momentum (p)(kg ms-1) =

mass (m)(kg) x velocity (v)(ms-1)

Impulse (Δp)(kg ms-1) = change in momentum =

net force (Fnet)(N) x time (t)(s)

psystem, before = psystem, after

m1 x u1 + m2 x u2 = m1 x v1 + m2 x v2 or v(m1 +m2)

Work done (W)(J) =

force (F)(N) x distance moved in direction of the force (d)(m)

kinetic energy (Ek)(J) =

1/2x mass (m)(kg) x velocity2 (v)(ms-1)

GPE (Ep)(J) =

mass (m)(kg) x gravitational field strength (g)(ms-1) x height (h)(m)

Power (P)(W) =

work done (W)(J)/time taken (t)(s) = energy transferred (W)(J)/time taken (t)(s)