✓ Sources checked · 10 September 2026 · View verification
Released objects accelerate downward near Earth because gravity acts on them. Their actual motion also depends on initial velocity, air resistance, buoyancy and any remaining support forces.
By Matan · Updated
Define the ideal experiment
Free fall means gravity is the only force in the model. Near Earth’s surface over a modest height, take g approximately constant. Objects released with the same initial velocity then have the same acceleration regardless of mass. Down is the local gravitational direction, not a universal direction through space. [1]
Worked two-second fall
Release an object from rest and neglect air resistance. After 2.0 s with g = 9.8 m/s², downward speed is gt = 19.6 m/s and distance fallen is ½gt² = 19.6 m. The equal numerical values have different units and are coincidental; after 1 s they would be 9.8 m/s and 4.9 m.
Why a leaf differs from a stone
Drag depends on shape, area, speed and fluid properties. As a falling object speeds up, drag can grow until the forces approximately balance, giving terminal speed. Cloud droplets have weight all along; their fall relative to air and transport by upward air motion determine whether they reach the ground.
Upward motion can still have downward acceleration
A tossed ball continues upward while gravity slows it, then turns and falls. At its highest point its vertical speed is momentarily zero but acceleration is still downward. Gravity differs from magnetism, so a giant-magnet analogy can mislead.
Continue learning
- Gravity: The Universe’s Invisible Glue
- Why is the equivalence between inertial and gravitational mass important in physics
- Newton’s Laws for Real Life
How this article was checked
Sources checked; calculations checked where shown. Main claims and model assumptions were checked against the references below. Example arithmetic and units were checked separately. Numerical examples are illustrative calculations, not experimental measurements.
Source checking and editing assisted by AI. No independent human scientific review is recorded for this revision. This record applies to the version dated 10 September 2026.
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Sources and further reading
Cite this article
Matan. “Why Things Fall Down.” Your Physicist. Originally published 2026-06-24; updated 2026-09-10. https://your-physicist.com/why-things-fall-down/
Revision history
10 September 2026: Added a unit-explicit fall calculation and corrected magnet and cloud-droplet analogies. Added references and a transparent verification record.
