Gravitational force between two spheres

PhysicsGravitation & AstronomyAges 16–17

Two spheres sit on an axis, each held back on a rope by a person standing outside so that it is not pulled towards the other. Change the masses m₁, m₂ and the centre-to-centre distance r with the sliders or by dragging the spheres, and watch the force arrows, how far each person leans and the value F = G·m₁·m₂/r² update in real time; F can be shown in scientific notation a×10ⁿ or as a decimal, and "Constant size" keeps the drawn sphere size separate from the actual mass. Adapted from the "Gravity Force Lab" simulation by PhET Interactive Simulations, University of Colorado Boulder (CC BY 4.0); rewritten.

Lesson: Gravitational fields