Crocodile Clips
Simple Simulation Software
Motion and Forces
Crocodile Physics lets you experiment freely with forces and motion, with control over a wide range of parameters.
Add balls, blocks and carts, position them as you wish, and drop, accelerate or collide them. Define parameters like mass, elasticity, coefficient of friction, dimensions, velocity and driving force, and add your own images to give context.
Attach rods and springs to investigate simple pendulums, spring oscillations, Hooke's Law and rotational motion.
Slopes and grounds add gravity to your simulations - you can set the strength of this field, and also the elasticity and friction of the ground.
The Graph part lets you follow the motion of your parts. You can plot many quantities against time or against other part properties.