Both are forces that oppose motion ($\F_f = \mu F_N$). Static friction prevents motion, while kinetic friction opposes motion of sliding objects.

Elastic: Both momentum and kinetic energy are conserved. Inelastic: Momentum is conserved, but kinetic energy is not.

Period (T): The time for one complete cycle. Frequency (f): The number of cycles per unit time. They are inversely related: $T = \frac{1}{f}$.

Displacement (Δx) is the change in position. It's a vector!

Velocity (v) is the rate of change of displacement. Also a vector!

Acceleration (a) is the rate of change of velocity. It's a vector.

Work (W) is the transfer of energy by a force. $W = Fd\cos(\theta)$.

Kinetic Energy (KE) is the energy of motion. $KE = \frac{1}{2}mv^2$.

Impulse (J) is the change in momentum. $J = F\Delta t = \Delta p$.

Torque ($\tau$) is the rotational analog of force. $\tau = rF\sin(\theta)$.

Centripetal acceleration ($a_c$) is the acceleration directed towards the center of the circle. $a_c = \frac{v^2}{r}$

Gravitational Force ($F_g$) is the attractive force between two masses. $F_g = G\frac{m_1m_2}{r^2}$, where G is the gravitational constant.

Momentum (p) is the product of mass and velocity. $p = mv$. It is a vector quantity.

The object accelerates ($F_{net} = ma$).

The object's kinetic energy changes ($W_{net} = \Delta KE$).

The object's momentum changes ($J = \Delta p$).

The object experiences angular acceleration ($\tau_{net} = I\alpha$).

The gravitational force between them decreases ($F_g = G\frac{m_1m_2}{r^2}$).

It stores elastic potential energy ($PE_s = \frac{1}{2}kx^2$).