Question

1. a student pushes horizontally on a book with a force of 2 n, which causes the book to slide at a constant velocity. what is the force of friction on the book?

type your answer here:
(score for question 2: ___ of 5 points)

1. a car collides with a wall. compare the forces exerted by the car on the wall and by the wall on the car.

type your answer here:

Explanation:

Step1: Analyze the motion of the book

When the book is sliding at a constant velocity, it is in a state of equilibrium. According to Newton's first law, the net force acting on an object in equilibrium is zero.

Step2: Determine the force of friction

The horizontal forces acting on the book are the applied force \(F = 2\space N\) and the frictional force \(f\). Since the net force \(F_{net}=F - f=0\) (because \(a = 0\) for constant velocity), we can solve for \(f\).

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Step3: Analyze the car - wall collision

According to Newton's third law, when two objects interact, the forces they exert on each other are equal in magnitude and opposite in direction.

Answer:

1. The force of friction on the book is \(2\space N\).
2. The force exerted by the car on the wall is equal in magnitude and opposite in direction to the force exerted by the wall on the car.