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This java application simulation shows the force (applied, frictional, and total), position, velocity, and acceleration graphs of a person pushing on an variety of objects. The force can be created either by the use of a mouse or using pre-programmed values. A comparison between the static and kinetic frictional forces can be made. Newton's first and second law can be applied as well. More information is available at http://www.colorado.edu/physics/phet/.
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