hat is a force?
Newton’s First Law of motion defines force.
It says that every body continues to be in its state of rest or in its state of uniform motion in a straight line till such time as an external FORCE starts acting on it. The force
•Causes its velocity to change-either the body moves faster or it slows down, or
•Causes its direction of motion to change, or
•Causes its shape to change-like when we apply force on a dough of flour (atta), its shape changes
Newton’s Second Law of motion helps us to measure this force.
It says that the rate of change of momentum is proportional to the external force.
We know momentum is mass x velocity.
So Force = P= rate of change of momentum = mass x rate of change of velocity = mf
Since rate of change of velocity is also called acceleration
Newton’s Third Law of motion
It simply says that every action has an equal and opposite reaction.
When you are standing, you apply a force equal to your mass x acceleration due to gravity on the floor, the floor also exerts an equal and opposite force on you.