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# (ll) A 20.0-kg box rests on a table. (a) What is the ISBN: 9780130606204 3

## Solution for problem 5P Chapter 4

Physics: Principles with Applications | 6th Edition

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Problem 5P

(ll) A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0-kg box is placed on top of the 20.0-kg box, as shown in Fig. 4-43. Determine the normal force that the table exerts on the 20.0-kg box and the normal force that the 20.0-kg box exerts on the 10.0-kg box. Step-by-Step Solution:

We have to calculate the value of weight of a box and normal force it exerts and experienced due to other bodies in the system.

A] Weight of 20kg box and normal force acting on it                                                 Step 1 of 3  Concept:    Newton’s second law: The force Facts on mass m produces an acceleration a in the object.    Newton’s third law: For every action, there is an equal and opposite reaction.                                                Step 2 of 3</p>

Free Body Diagram:

Using Newton’s second law, Weight of 20kg block acting vertically downward on the table. Step 3 of 3</p>

Using Newton’s third law,

The normal reaction exerted on 20kg block by the table acting vertically upward.

B] Normal force that table exert on 20kg box and the normal force that 20kg box exert on 10kg box

Step 1 of 4  Concept:    Newton’s second law: The force F acts on mass m produces an acceleration a in the object.    Newton’s third law: For every action, there is an equal and opposite reaction.                                                Step 2 of 4</p>

Free Body Diagram: Using Newton’s second law,

Weight of 10kg block acting vertically downward on the 20kg block.

Step 3 of 4

Step 4 of 4

##### ISBN: 9780130606204

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