Chapter 3
Forces
Newton's three laws of motion, gravitation, contact forces and equilibrium, mass and weight, freely falling bodies, and momentum and its conservation.
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3.1 Newton's Laws of Motion
3.2 Gravitational Force and Newton's Law of Gravitation
3.3 Different Kinds of Forces
3.4 Mass and Weight
3.5 Freely Falling Bodies
3.6 Momentum and Law of Conservation of Momentum
Try it yourself
🔬 Forces and Motion: Basics
Push objects around and see how applied force, friction, and mass combine to produce acceleration.
Try this: Apply a force to the crate, change its mass, and switch the surface between frictionless, ice, and grass.
Look for: Watch the net-force arrow in the "Friction" screen — the object only accelerates once applied force exceeds friction.
Simulation by PhET Interactive Simulations, University of Colorado Boulder — licensed CC BY-NC. View on phet.colorado.edu ↗