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REPRESENTATION OF VECTORS

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Find unit vector in direction of friction force acting on block B kept on moving platform P (Fig. 6-17). Given,
`vecv_(p)=7hati-2hatj,vecv_(B)=3hati+hatj`
Calculation: `vecv_(B//P)=3hatj+hatj-(7hati-2hatj)=-4hati+3hatj`
Friction on B due to P must be opposite of the velocity of B with respect to P.

Top view of a block kept on a moving platform. Friction on B due to P.
`hatf_(k)=-v_(B//P)=+(4)/(5)hati-(3)/(5)hatj`
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