This is a place for experiments and tools.
Plot mathematical functions.
Explore elements with summaries, images, and properties.
Interactive physics experiments with Newton's laws, motion, and more.
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Inertia is the tendency of matter to resist changes in velocity.
Motion along a straight line: position, velocity, acceleration, and the relationships between them.
The acceleration of an object depends on the net force acting on it and its mass: F = ma.
For every action there is an equal and opposite reaction. Forces always occur in pairs.
Momentum is the product of mass and velocity. Conservation of momentum in isolated systems.
Kinetic and potential energy; work and the conservation of energy.
Angular velocity, angular acceleration, torque, and moment of inertia.
Gravitational force, free fall, and orbital motion.