Question

Assertion: If a balanced force is applied on a wooden block it will move
Reason: Unbalanced force changes the state of motion or rest while balance force

does not.​

Answer 1

Explanation:

Balanced and Unbalanced Forces

First Law

Inertia and Mass

State of Motion

Balanced vs. Unbalanced Forces

Newton's first law of motion has been frequently stated throughout this lesson.

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.Balanced Forces

But what exactly is meant by the phrase unbalanced force? What is an unbalanced force? In pursuit of an answer, we will first consider a physics book at rest on a tabletop. There are two forces acting upon the book. One force - the Earth's gravitational pull - exerts a downward force. The other force - the push of the table on the book (sometimes referred to as a normal force) - pushes upward on the book.

Balanced Forces

But what exactly is meant by the phrase unbalanced force? What is an unbalanced force? In pursuit of an answer, we will first consider a physics book at rest on a tabletop. There are two forces acting upon the book. One force - the Earth's gravitational pull - exerts a downward force. The other force - the push of the table on the book (sometimes referred to as a normal force) - pushes upward on the book.

Since these two forces are of equal magnitude and in opposite directions, they balance each other. The person is at equilibrium. There is no unbalanced force acting upon the person and thus the person maintains its state of motion. (Note: diagrams such as the one above are known as free-body diagrams and will be discussed in detail in Lesson-2)

Answer 2

The correct answer is (c) assertion is incorrect but reason is correct.

• If a balanced force is applied on a wooden block, then the block will not move due to inertia.
• This can be understood by Newton's first law of motion. A body cannot change its state of rest or uniform motion in the absence of unbalanced force. The net force of the balanced force is zero.
• Thus, the assertion statement is incorrect which states balanced force can move the wooden block. But the reason statement is true which states that unbalanced force can change the state of rest or motion while balanced force cannot.