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The diagram illustrates a ball of mass m sliding down a plank inclined at an...

Physics
WAEC 2020

The diagram illustrates a ball of mass m sliding down a plank inclined at an angle of 0 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?

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  • A. mgsin \(\theta\)
  • B. mgtan \(\theta\), mgcos \(\theta\)
  • C. mgcos \(\theta\)
  • D. mgcot \(\theta\)
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Correct Answer: Option C
Explanation

The normal reaction/force on a body on a horizontal surface is R = mg; but that on a body on an inclined surface is R = mgCosθ.

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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid