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Chapter 7: Problem 977

Writing on black board with a pieace of chalk is possible by the property of (A) Adhesive force (B) Cohesive force (C) Surface force (D) Viscosity

Short Answer

Expert verified
The correct force that enables writing on a blackboard with a piece of chalk is (A) Adhesive Force, as it is responsible for the chalk particles adhering to the blackboard's surface, allowing writing to occur.

Step by step solution

01

Introduction to Forces

Before identifying the correct force, let's briefly describe the four types of forces mentioned in the exercise: 1. Adhesive Force: The attractive force between two different types of molecules or surfaces. 2. Cohesive Force: The attractive force between similar types of molecules or surfaces. 3. Surface Force: Forces that act on an object at the surface, resulting from the elasticity, adhesion, or cohesion of the material. 4. Viscosity: The measure of a fluid's resistance to flow. Now, let's analyze each force and its relation to writing on a blackboard with a piece of chalk.
02

Adhesive Force

Adhesive forces are responsible for the attraction between two different types of materials or surfaces. When writing on a blackboard with chalk, chalk particles adhere to the blackboard's surface, leaving behind a visible mark. This force contributes to the writing process; however, we'll also consider the other forces to ensure the most accurate answer.
03

Cohesive Force

Cohesive forces occur between similar types of molecules or surfaces. In the case of writing with chalk, cohesive forces play a role in holding the chalk particles together, but they do not directly contribute to the ability to write on a blackboard. As such, cohesive force is not the correct answer.
04

Surface Force

Surface forces involve the interaction of objects at the surface, either due to elasticity, adhesion, or cohesion. Although surface forces include adhesive and cohesive forces, the term "surface force" is more general and does not specifically describe the interaction between chalk and blackboard when writing. Therefore, surface force is not the correct answer.
05

Viscosity

Viscosity refers to the resistance to flow of a fluid and does not apply to the process of writing with chalk on a blackboard, as neither the chalk nor the blackboard is a fluid. Thus, viscosity is not the correct answer.
06

Conclusion

Based on the analysis of the four types of forces given in the exercise, it can be concluded that the correct answer is (A) Adhesive Force, as it is responsible for the chalk particles adhering to the blackboard's surface, allowing writing to occur.

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