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Matter.js is a 2D rigid body physics engine for the web written in JavaScript (yes, another).

Features:

• Physical properties (mass, area, density etc.)
• Rigid bodies of any convex polygon
• Stable stacking and resting
• Restitution (elastic and inelastic collisions)
• Conservation of momentum
• Friction and resistance
• Constraints
• Gravity
• Composite bodies
• Sleeping and static bodies
• Original JavaScript physics implementation (not a port)
• HTML5 canvas renderer (optional)
• Mobile-compatible (touch, scaleable)
• Cross-browser (chrome, firefox, IE8+)
• World state serialisation (requires resurrect.js)
• Built in GUI for testing (requires dat.gui.js)
• Time scaling (slow-mo, speed-up)
• Broad-phase, mid-phase and narrow-phase collisions
• Events (edge)
• Sprite texture rendering (edge)