Laws of Motion

Inertia — object at rest stays at rest; object in motion stays in motion. Toggle friction to see the difference.

F = ma — apply a force, change the mass, see acceleration respond in real time.

Action–reaction pairs — equal magnitude, opposite direction, act on different bodies.

Experience all three laws of Newton through interactive demonstrations — from inertia to action-reaction pairs.

Build FBDs for flat, push, inclined, and hanging scenarios — see all forces labelled.

See the difference between fₛ (adjustable up to μₛN) and fₖ (constant) in action.

Explore static and kinetic friction on flat and inclined surfaces. Adjust angles and coefficients to see real-time effects.

Block on incline — compute gsinθ, gcosθ, friction, net acceleration, angle of repose.

Two masses over a pulley — live acceleration and tension from a = (m₂−m₁)g/(m₁+m₂).

Two blocks pulled by a force, connected by a string — compute shared a and tension T.

N = m(g+a) — feel heavier going up, lighter going down, weightless in free fall.

Turn on a banked curve — compute vIdeal, vMax, vMin with and without friction.

Resolve a force at angle θ into Fx = F cosθ, Fy = F sinθ — see the components in real time.

Tilt the incline until the block just slides — see θ_repose = tan⁻¹(μ_s) emerge.

Block on movable wedge — both accelerate. See the recoil and coupled motion.

Mass on a string in circular motion — tension provides T = mv²/r live.