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Motion in a Straight Line — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsMotion in a Straight Line1 Mark
Question
It is a common observation that rain clouds can be at about a kilometre altitude above the ground.
Rate of change of momentum is force. Estimate how much force such a drop would exert on you.
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Answer

Key concept: This problem can be solved by kinematic equations of motion and Newton’s second law that $\text{F}_\text{ext}=\frac{\text{dp}}{\text{dt}}$ will be used, where dp is change in momentum over time dt. Force exerted by a rain drop is$\text{F}=\frac{\text{Change in momentum}}{\text{Time}}=\frac{\text{p}-0}{\text{t}}$
$=\frac{4.7\times10^{-3}}{2.8\times10^{-5}}=168\text{N}$

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