Why objects stop accelerating even when gravity never lets go
In short: Ever wonder why a skydiver doesn't keep getting faster forever? This video breaks down the physics of terminal velocity, explaining how air resistance balances out gravity to create a constant speed.
When an object falls, it is pulled by a constant downward force of weight. However, as its speed increases, it encounters greater upward air resistance (drag). The video explains the transition from initial acceleration—where weight exceeds drag—to the moment they become equal.
At this equilibrium point, the resultant force becomes zero, and acceleration stops, leaving the object at a constant terminal velocity. You can visualize this on a velocity-time graph: the gradient flattens into a horizontal line as the forces balance. The video also demonstrates how increasing surface area, such as opening a parachute, creates more drag to reach a lower terminal velocity.
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Sources
- Summary by Intellect · source: GCSE Physics - Terminal Velocity - What Affects Air Resistance | Resultant Force & Acceleration
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