Translation vs rotation - straight line vs spinning

circular motion - always have acceleration (bc changing direction)

all kinematics equations can be replaced with rotational equivalents

linear speed/ acceleration can be found through multiplying by the radius

torque

• max torque when theta=90
• The lever arm is r sin θ. It is defined as the perpendicular distance from the axis of rotation to the line of action of the force:

rotation occurs because of net torque, translation because of net force

Moment of inertia

reluctance to rotate

torque required to induce angular acceleration - depends on mass distribution

greater inertia when mass is distributed towards edge