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The diagram above illustrates a ball of mass m sliding dow...
waec-2020 ssce-exam-2020 waec-physics-2020 physics
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The diagram above illustrates a ball of mass m sliding down a plank inclined at an angle of θ to the horizontal. The kinetic friction between the ball and the plank is F and acceleration of free fall is g

The normal force on the ball is

A. mgsinθ

B. mgtanθ

C. mgcosθ

D. mgcotθ

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peter
Asked by peterrep:1.5K
University of Lagos Nigeria
31 August 2020

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1 answer(s)

adeb
Adeb answeredrep:258
School not set Nigeria
31 August 2020
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The normal force is the force that extends perpendicular (90o) to the surface.

W is the weight of the ball and Fn is the normal force.

From the above diagram, resolving W to the the Fn (extended or broken line), yields: mgcosθ

Answer: C

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