Separate two attracting masses
Every pair of masses attracts. The inverse-square relationship means doubling separation reduces the force to one quarter. Changing either mass scales the force linearly.
Run this experiment →Physics · Class 11
Gravitation
7 free physics experiments and lesson notes for Gravitation, with model limits, worked examples and Tamil explanations.
Trace an equal-area orbit
An ellipse has the Sun at a focus. The planet moves faster near the Sun and slower farther away, sweeping equal areas in equal times. Increasing the semi-major axis increases the period according to T² proportional to a³.
Run this experiment →Probe gravity inside and above Earth
Above Earth, gravity falls by the inverse-square law. Inside a uniform sphere only the mass enclosed by the probe radius contributes, so gravity decreases linearly to zero at the centre.
Run this experiment →Explore the gravitational energy well
Gravitational potential is potential energy per unit probe mass. With zero at infinity it is negative at finite distance; work must be supplied to move the probe outward. Field magnitude decreases faster with radius than potential magnitude.
Run this experiment →Test the escape-energy threshold
Escape occurs when the launch kinetic energy cancels or exceeds the negative gravitational potential energy. The escape speed depends on the central body and launch radius but not the probe mass.
Run this experiment →Resize a satellite orbit
Gravity supplies centripetal acceleration in a circular orbit. Higher orbits have lower speed but greater circumference, so the period grows. Their total orbital energy is less negative.
Run this experiment →Match a sidereal rotation
A geostationary satellite remains above one equatorial longitude only when its orbit is circular, equatorial, prograde and has the Earth’s sidereal rotation period. Changing the period produces longitude drift.
Run this experiment →