Conservation of Momentum
Rain on a Cart 1
Rain on a Cart 2 (requires energy)
Rain on a Cart 3 (requires energy)
Pushing a Cart 1
Pushing a Cart 2 (requires energy)
Throwing Balls 1
Throwing Balls 2 (requires energy)
Throwing Balls 3 (requires energy)
Throwing Balls 4
Bug versus Windshield