Correct Answer - Option 2 : 0 N
Concept:
Law of Inertia
- A body will be in a position of constant motion in a single line unless acted upon by an unbalanced force.
- If the force is balanced, it will remain in constant motion.
- If unbalanced force is applied, it may change its speed or direction or even can be brought to rest.
- This is according to the first law of motion which is also known as the law of inertia
Explanation:
- Given, the body is moving with constant velocity.
- So, no unbalanced force is acting on it.
- The net force acting on it is zero.
The correct option is 0 N
Newton’s First law:
- A body continues to be in its state of rest or of uniform motion along a straight line unless it is acted upon by some external force to change the state.
- If no net force acts on a body, then the velocity of the body cannot change i.e. the body cannot accelerate.
-
Newton’s first law defines inertia and is rightly called the law of inertia.
Newton’s Second Law:
- The rate of change of linear momentum of a body is directly proportional to the external force applied on the body and this change takes place always in the direction of the applied force.
- If a body of mass m moves with velocity \(\vec v\)then its linear momentum can be given by \(\vec p = m\vec v\) and if force is applied on a body, then
\(\therefore \vec F = m\vec a\)
Where F = Force, m = mass and a = acceleration
Newton’s Third Law:
- To every action, there is always an equal (in magnitude) and opposite (in direction) reaction.
- When a body exerts a force on any other body, the second body also exerts an equal and opposite force on the first.
-
Forces in nature always occur in pairs. A single isolated force is not possible.
