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Q.24

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 155

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Short Answer

Bonnie and Clyde are sliding a kg bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with N of force while Bonnie pulls forward on a rope with N of force. What is the safe’s coefficient of kinetic friction on the bank floor?

The coefficient of kinetic friction on the bank floor is

See the step by step solution

Step by Step Solution

Step 1: Content Introduction

The mass of bank safe is

Force applied by Clyde on safe from behind is

Force applied by Bonnie in forward direction is

Draw free body diagram of the bank safe which will show all forces acting on the bank safe.

Step 2: Content Explanation

is the force applied by Clyde from bank side

is force applied by Bonnie

is force of kinetic friction acting in opposite direction of motion

is coefficient of kinetic friction

is the weight of bank safe, acting vertically downward direction

is normal force acting upward

Use Newton's second law of motion to find the net forces acting on the bank safe.

Net force acting vertical in direction is zero as there is no motion in vertical direction.

Net force acting horizontal in direction is zero as safe slides with constant speed.

Substitute the values,

Thus, the coefficient of kinetic energy on the bank floor is

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