A book is sitting on the very slick (frictionless) passenger seat of a car. The

Question

A book is sitting on the very slick (frictionless) passenger seat of a car. The car is moving at
a constant velocity. The driver suddenly hits his breaks. The book suddenly slides off the seat.
Why?
(a) A force acted on the book in the forward direction.
(b) A force acted on the book in the backward direction.
(c) A force acted on the car and the book in the forward direction.
(d) A force acted on the car and the book in the backward direction.
(e) No force acted on the book, so it continued to move at the same original velocity while the car
slowed down.

Explanation / Answer

Answer E. Recall that good ole Law (paraphrased) Object in motion stay in motion unless acted upon by another force) The book and car were in motion. The brakes exerted force on the car but not the book so the book kept going forward

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