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Key Areas covered. Terminal velocity. Velocity-time graph of a falling object when air resistance is taken into account, including the effect of changing surface the area of the falling object. What we will do today:. Revise what is meant by terminal velocity.
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Key Areas covered • Terminal velocity. • Velocity-time graph of a falling object when air resistance is taken into account, including the effect of changing surface the area of the falling object.
What we will do today: • Revise what is meant by terminal velocity. • Draw a v-t graph for a parachutist jumping from a plane until they reach the ground.
Terminal velocity • When an objects falls towards the Earth it has two vertical forces acting on it.
Terminal velocity • As the object falls towards Earth it’s velocity increases (due to the acceleration of gravity). • When the speed of an object increases so does the air resistance acting against it. • Eventually the two forces will balance out at the object will no longer accelerate (balanced forces = constant velocity). • This constant velocity is known as terminal velocity.
Parachutes • When doing a parachute jump, the parachute is released to increase the surface area and as a result, the air resistance (friction) increases. • This slows the parachutist’s velocity allowing them to land safely.
