AP Physics Quiz 14 Study Set - Torque and Angular Momentum

Static Equilibrium

ΣFₓ = 0, ΣFᵧ = 0, Στ = 0

Angular Momentum

L (kg m²/s)

Equation for Angular momentum (point mass)

L = r x p (sinθ)

equation for p in Angular momentum equation

p = mv

Equation for Angular momentum (rigid object)

L = (i)(ω)

Impulse-Angular Momentum Theorem

ΔL = (Στ)(Δt)

Right hand rule

point from r to F

Directions:

Out of page = positive; into page = negative

Steps to calculate net torque

1. pick an axis

2. calculate individual torques from axis

3. Find directions of torques

4. Add torques together

sin or cos?

Torque = sinθ; work = cosθ; angular momentum (L) = sinθ

Simple Harmonic Motion (SHM)

cyclical motion caused by a restoring force or a restoring torque that is proportional to the displacement from equilibrium.

Equation for SHM

ΣF = -kΔx; Στ = -kΔθ

Simple Harmonic Oscillator (SHO)

a system that undergoes simple harmonic motion

Rotational Kinetic Motion

Kᵣ = (1/2)(i)(ω²)