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OBINPHYS8 2.CQ.004.

A calculator is set on top of a book and the book is then pushed so that it slowly accelerates across a desk, taking the calculator

with it. The person pushing the book does not touch the calculator. What type of force causes the calculator to accelerate?

The calculator is accelerated by a static friction force caused by the book.

The calculator is accelerated by a static friction force applied by the person's hand.

The calculator is accelerated by a kinetic friction force caused by the book.

O The calculator is accelerated by a kinetic friction force applied by the person's hand.

Correct. This is because the calculator is touching the book (not the person's hand) and because the calculator is not moving

(static) with respect to the top of the book.

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