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Physics
Gravity force lab
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Attractionr = 4 m
Drag either object or its numbered handle. Arrows show direction; read the force above.
kg
kg
Changing mass can push the other sphere to prevent overlap.
m
m
Display options
Force on each object
N
F = G m₁m₂ / r²
F₁ and F₂ have equal magnitudes and opposite directions. They act on different objects.
The smaller mass experiences just as much force as the larger mass. Increasing either mass increases the force; increasing distance reduces it by the square of the distance ratio.
Keep a reference, then change one variable to discover the relationship.
Each situation starts from the default setup.
Model notes
- Uniform spherical masses, outside each other, held at rest. This shows Newtonian forces, not trajectories, acceleration or orbits.
- Variable-size spheres use density 150 kg/m³. Fixed-size mode uses radius 0.5 m. Changing mass can move a neighbour to avoid overlap; always check r.
- G = 6.67408 × 10⁻¹¹ N·m²/kg² is the gravitational constant used in this model. Arrows indicate direction, with equal lengths for the equal forces.