Penguin clip art showing 29 different examples of energy and forces.Balanced and Unbalanced Forces:Includes Skiing, Walking, Sledding, Swimming, Diving, Tug of war, Sky diving, Ice hockey, Fishing. Each pair has a balanced and unbalanced version.Kinetic and Gravitational Energy:Includes dodgem cars, coconut shy, roller coaster ride, ball pool slide, test your strength machine. Each pair shows an example of kinetic and gravitational energy transfer. This clip art set includes 29 color and 29 blac