Newton’s first law of motion, also known as the law of inertia, states that:
“An object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity, unless acted upon by an external force.”
You have often observed the table placed in your classroom. It always remains at the same place until you apply some force to move it. Contrary to the above example, a ball rolling on the ground however stops after some time because friction of ground and air resistance exert force on it and change its state of motion or direction of motion.
Newton’s first law of motion states that an object in a state of uniform motion will remain in that state of motion unless acted upon by an external force. This means that if an object is at rest, it will stay at rest unless a force is applied to it, and if an object is moving, it will continue to move at a constant speed in a straight line unless a force acts on it. This law is often referred to as the law of inertia, as it describes the tendency of an object to resist any change in its state of motion. The law applies to all objects, regardless of their size or mass, and is a fundamental principle in the study of classical mechanics.
Newton’s second law of motion states that:
“The acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass.”
According to first part
a ∝ F
According to second part
a ∝1/m
After combining both equations
a ∝F/m
am ∝ F
F = kma
Where k is the constant of value 1 then,
F = (1) ma
F = ma
Newton’s third law of motion states that:
“To every action, there is an equal and opposite reaction”
Action = − Reaction
