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: $T = \frac{1}{f}$.

Increasing the mass increases the period of oscillation. $T = 2\pi\sqrt{\frac{m}{k}}$

Increasing the length increases the period of oscillation. $T = 2\pi\sqrt{\frac{L}{g}}$

It causes angular acceleration. $\tau_{net} = I\alpha$

The object accelerates in the direction of the net force. $F_{net} = ma$

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 ($PE_s = \frac{1}{2}kx^2$).