20 – Work and Energy

20.03  Lever arm (also listed as 28.06, under Rotational Motion, and as 32.03, under Equilibrium and Elasticity)

20.06  Large pulley

20.09  Small pulleys

20.12  Pile driver

20.15  Potential well (also listed as 32.20 -- Neutral, stable and unstable equilibrium, under Equilibrium and Elasticity)

20.18  Parabolic versus skewed parabolic path

20.21  Cart between two springs

20.24  Toy van up incline

20.27  Launch sleeve with compressed spring

20.30  Pogo stick

20.33  Jumping handball

20.36  Stopped pendulum

20.39  Bowling ball pendulum

See also the following demonstrations, under Energy Conversion in chapter 52, Heat and Thermodynamics:

52.29  Four-cycle engine model

52.33  Mechanical equivalent of heat

52.36  Falling weight generator (also listed under 72.15 -- generators do work)

52.39  Bicycle generator (also listed under 72.15 -- generators do work)

52.41  Peltier element

52.42  Thermoelectric fan

52.45  Solar cell-powered motor

52.48  Electrochemical cell (also listed as 64.03, under “Electric Currents ”)