The bob of a simple one of these moves with simple periodic motion
Triple Choice If the mass of a pendulum bob is increased, does the period
... [DOC] [TLE] Good Vibes: Introduction to Oscillations [PAR] characteristics of simple harmonic motion: amplitude, displacement, period, 
frequency ... examples of periodic motion: the earth revolving around the sun, an 
elastic ball bouncing up ... move to the left until it reaches equilibrium and stop 
there.