q = s/r

1 rev = 360^o = 2 p rad

Dq = q₂ - q₁

v = rw

a_t =ra

a_r = v²/r = w²r

T = (2pr)/v = (2p)/w

I = I_cm + Mh²

, t = rFsin(f)

t = rF_t = rÁ F = rFsinf

v_cm = wR

K = (1/2)I_cmw² + (1/2)

T² = (4p²/(GM_s))r³

T=1/f = 2p/w

x = A cos(wt + f)

v = -wA sin(wt + f)

a = -w² A cos(wt + f)

U(t) = 1/2kx²

E = U + K = ½ kA²

, G=6.67x10^-11N^.m²/Kg²

F = ma_g, a_g = GM/r²