1. Physics Section 11.1 Apply harmonic motion
An object that follows a repeated path in equal intervals of time exhibits periodic motion.

2. Simple harmonic motion is a (periodic motion) vibration about an equilibrium position in which the force and the acceleration are directed toward the equilibrium and are proportional to the displacement from the equilibrium.

3. Hooke’s Law F = -kx F = spring force (N) K = force constant (N/m)
x = displacement (m)

4. example
A mass of .35 kg is attached to a vertical spring causing it to stretch 14 cm. What is the force constant of the spring?

5. example
A spring has a force constant of 75 N/m. What force will cause it to stretch the spring .40 m?

6. A pendulum exhibits harmonic motion if the angle of rotation remains small.
In harmonic motion, the sum of the potential and kinetic energies is constant.

7. assignment
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Problems 1 - 4