1. Pendulums

2. Pendulum Phet Investigation

3. A SIMPLE PENDULUM
A string with a mass at the end which is free to swing

4. LENGTH OF THE PENDULUM
Distance from the point of suspension to the mass
It is denoted by L

5. Equilibrium OF THE PENDULUM
“B” is the equilibrium position
A and C are the extreme points

6. OSCILLATION – movement back and forth
The motion of the mass from its extreme position A to C and back to A

7. Period of a Pendulum
Period (T)– amount of time to complete one oscillation
Length of string (L)
Acceleration due to gravity (g) =9.8 m/s2
𝑇=2π 𝐿 𝑔

8. What about Mass??
The period of a pendulum DOES NOT depend on the mass that is swinging!

9. Resonance
When a force is applied to an oscillating object at time intervals equal to the period
Increases amplitude
Examples: pumping on a swing, jumping rhythmically on a trampoline, rocking your car back and forth to free it from a snow bank