Question

State Newton’s first law of motion and give its one example.

Answer 1

Hint: There are three of Newton’s laws of motion. These laws describe the relationship between the body and the forces acting on it.

Complete answer:
Newton’s first law of motion states that a body at rest will remain at rest position only and a body which is in motion continues to be in motion unless otherwise they are acted upon by an external force. In simple terms, we can say that the objects cannot start or stop or change direction by themselves and they require some external force to act on them.
Inertia is the resistance offered by an object to change its velocity. Inertia is defined as the property of the body which remains at rest or which remains in motion by maintaining the constant velocity. Hence Newton’s first law of motion is sometimes called the law of inertia.
Example:
A moving object in motion – It continues to be in motion till some outside force is applied.
Newton’s first law of motion also says that if the net force acting on the object is zero then it will have zero acceleration.
Thus when an object is at rest it will have zero velocity and zero acceleration. When an object is in motion the velocity will not be equal to zero but the acceleration will be equal to zero.

Note: 1. The change in the energy that can be either the kinetic energy or the potential energy in an object is called an external force. Examples of external force are air resistance, friction force, normal force, etc.
2. Normal force always acts perpendicular to the surface of the contact.