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Object Falling in a Fluid

An object falling in fluid experiences an upward drag force due to fluid resistance and upthrust.The weight of the object mg acts downwards.
Initially the acceleration is g, drag = 0Drag force increases with speed so the resultant force decreases.

ΣF = W - D - U

where U is the upthrust. As resultant force decreases, acceleration decreases to zero.

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Specification: AQA Physics (7407), AS-level, 3.4.1.5 Newton's laws of motion. Topic: Newtons Laws of Motion.

Key terms in this lesson

Momentum
The product of an object's mass and its velocity; a vector quantity, conserved in any interaction provided no external resultant force acts.

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