Ap Physics 1: Variables Quiz Unit 12

For studying variables.

F_g [N]

Weight or force of gravity

g [N/kg or m/s²]

Gravitational field strength

r (forces) [m]

distance between the centers of two masses

r (orbits) [m]

distance from the center of the planet to the orbiting object

G EC Memorization: 6.67×10^-11 N*m²/kg²

gravitation constant

θ (motion) [rad]

angular position

Δθ [rad]

angular distance

ω [rad/s]

angular velocity: rate of change of angular position

α [rad/s²]

angular acceleration: rate of change of angular velocity

Δx or s [m]

arc length or circular distance

V_t [m/s]

tangential velocity

a_t [m/s²]

tangential acceleration; changes speed; points tangentially forward/backward

a_c [m/s²]

centripetal acceleration: changes the direction; points towards the center

τ [N*m]

torque

θ (torque) [degrees sign]

angle between moment arm and force

Rotational equilibrium

Net torque = 0 => angular acceleration = 0

Translational equilibrium

Net force = 0 => acceleration = 0

Static equilibrium

Net torque and net force =0 => no acceleration

I (rotation) [kg*m²]

moment of inertia: resistance to CHANGE in angular motion

r (rotation) [m]

distance from pivot point to force or object

L [kg*m²/s]

angular momentum

ΔL (effect) [kg*m²/s]

angular impulse: change in angular momentum

J_rot (cause) [Nm*s]

Angular impulse: an external torque applied for a time interval

K_rot [J]

rotational kinetic energy