Explain why friction is necessary to make the disc in Fig. 7.41 roll in the direction indicated: Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins.
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We know that, v = R ω
Point A : v ( A ) = R ω ο ( in the direction of arrow. )
Point B : v ( B ) = R ω ο ( in the opposite direction of arrow.)
Point C : v ( C ) : v ( C ) = ( R / 2 ) ω ο ( in the direction of arrow ).
⏺️The disc WILL NOT ROLL in the direction indicated. Because the disc is placed on a perfectly frictionless table and without friction, a body cannot roll. ( Rolling friction is needed. ).
We know that, v = R ω
Point A : v ( A ) = R ω ο ( in the direction of arrow. )
Point B : v ( B ) = R ω ο ( in the opposite direction of arrow.)
Point C : v ( C ) : v ( C ) = ( R / 2 ) ω ο ( in the direction of arrow ).
⏺️The disc WILL NOT ROLL in the direction indicated. Because the disc is placed on a perfectly frictionless table and without friction, a body cannot roll. ( Rolling friction is needed. ).
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