I am confused!! Someone help me out??

There was an Assertion/Reason in our last test at coaching. I am still confused on it!

Statement 1: If a disc of radius $\frac{R}{2}$ rolls in a circular ring of radius R without slipping then all particles on circumference of disc moves on straight lines. (Ring is fixed)

Statement 2:Angular velocity of disc and the angular velocity of centre of the disc wrt centre of ring are equal.

A) Statement 1 is false and Statement 2 is true.

B) Satement 1 is true and Statement 2 is false.

C) Both are true, and Statement 2 explains Statement 1.

D) Both are true, but Statement 2 does not explains Statement 1.

Thats quite obvious that statement two is wrong as angular velocities being vectors in opposite direction cannot be equal. Can someone explain how statement 1 is correct?

#RotationalMotion #AngularVelocity #Mechanics #Newtonianphysics #NoSlipCondition

Easy Math Editor

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Comments

Here is the solution.

Image

Pranjal Jain - 6 years, 6 months ago

Here is an excellent article on discs rolling inside rings of various sizes. Scroll down to the discussion regarding a disc of half the radius of the ring to find three diverse proofs of statement 1. Sorry for 'being lazy' and just providing a link, but since an explanation is greatly enhanced by the inclusion of diagrams I felt this was the appropriate thing to do.

Brian Charlesworth - 6 years, 6 months ago

Yeah! Ok thanks! Lemme check it out!

Pranjal Jain - 6 years, 6 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$