Work Comparison
The work done on three blocks of different mass are compared when the same size force acts over the same distance. Displayed is the transformation of work into kinetic energy of the blocks. Work Comparsion QT Movie (240K)

Pushing Puck
A puck is pushed along a rough, horizontal surface by a constant force that makes an angle with the horizontal. The work done by the applied force and that of friction are displayed along with the velocity and acceleration of the puck. Pushing a Puck QT Movie (450K) - Work done in Pushing Puck Problem

Non Hookian Spring
A non-Hooke's-Law spring has a restoring force that depends on the cube of its displacement from equilibrium according to the equation F(s) = -as - bs³. Displayed are the work and spring force as function of the springs diplacement. The simulation also shows what happen if you release the spring and alow the spring to oscillate. Non Hookian Spring Problem

Constant Power Bat Engine
Batman develops a constant power jet-engine to boost his acceleration. Displaved are the dynamics and limitations of such a engine. The thrust of the bat-engine is shown to decrease with time. Bat Engine Problem

Air Drag on a Cyclist
A cyclist produces a constant force to propel himself and his bicycle along. The force he produces determines the maximum speed he can reach when there is air resistance. If he starts from rest, his speed will reach a terminal velocity when the force he produces is equal to his air drag. Air Drag on a Cyclist Problem. | Air Drag on a Cyclist QT3 Movie

Energy of Oscillating Bob
A bob oscillates vertically on the end of a spring. The various forms of energy are displayed: the bob's gravitational potential energy, the spring's potential energy, the bob's kinetic energy, and the total mechanical energy of the system of the bob and spring.
Energy of Oscllating Bob QT Movie (300K) & ZeroEnergy Oscillating Bob QT Movie (300K)

Equal Energy Collision of two Blocks
Two blocks with the same kinetic energy collide with each other on a frictionless, horizontal surface. The initial kinetic energy of both blocks can be adjusted as well as the mass of each block. The simulation adjusts the block's velocities so that always have the same initial kinetic energy. The purpose of the simulation is to chance one's preconceived ideas about energy as a form of motion.

Tarzan's Elavator
Two platforms at different heights are connected by a frictionless pulley. When the higher platform has more mass it will accelerate downwards , thereby raising the other platform. Displayed are the values of the various forms of energy of the platforms: the potential, kinetic, and mechanical energy. The mass of the platforms can be adjusted. Tarzan's Elevator Problem

Jumping Flea
A flea jumps with a certain speed and reaches a height which is less than the maximum height the flea could jump if no energy were lost due to air resistance. Graphed is the flea's mechanical, potential , and kinetic energy as he sail through the air. Jumping Flea Problem | Jumping Flea QT3 Movie