A block of mass 2 kg is placed on a disc which is rotating at constant angular velocity 4 rad/s. Find the friction force (in N) between block and disc if block is not sliding.

 

Block is not slipping, so

f = mrw² = 2 × 1 × 16 = 32

<div class="photo-widget-full"><div class="figure"><picture><source srcset="" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/1758870695phpXx3Ujf.jpeg" alt="" width="201" height="192" loading="lazy"></picture></div></div><p>&nbsp;</p><p><span lang="EN-IN">Block is not slipping, so</span></p><p><span lang="EN-IN">f = mr</span><span lang="EN-IN">w</span>^{<span lang="EN-IN">2</span>}<span lang="EN-IN"> = 2 × 1 × 16 = 32</span></p>

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