Question

Answer who really know all the answers properly. ​

Answer 1

Answer 1 :

→ If the resultant of all the forces acting on a body is zero, the forces are called Balanced Forces. They can't produce motion in. stationary body or stop a moving body, they can, however, change the shape of the body

If the resultant of all the forces acting on a body is not zero, the forces are called Unalanced Forces. They can stop a moving body or can move a stationary body.

Answer 2 :

First Law : A body at rest will remain at rest, and a body in motion will continue in motion in a straight line with a uniform speed, unless it is compelled by an external force to change its state of rest or of uniform motion.

Second Law : The rate of change of momentum of body is directly proportional to the the applied force, and takes place in the direction in which the force acts.

Third Law : To every action there is an equal and opposite reaction.

Answer 3 :

Newton's second law of motion can be expressed as

$\sf \: Force \propto \dfrac{Change \: in \: momentum}{Time \: taken}$

Consider a body of Mass m having initial Velocity u. initial momentum will be mu. let the force acting on this body nr F on the time t and causes the final Velocity to be v. Final momentum is mv now. Now, change in momentum is now mv - mu

$\sf \: F\propto \dfrac{mv - mu}{t}$

or

$\sf \: F\propto \dfrac{m(v - u)}{t}$

Here, $\sf\frac{v-u}{t}$ can be used to represent the acceleration

$\sf \: F\propto \: ma$

Thus, the force acting is directly proportional to the product of mass and the acceleration. This can be turned into equation by putting a constant k

$\sf \: F\ = \:k \times m \times \: a$

Value of constant k is 1, so

$\sf \: F\ = m \times \: a$

$\large \boxed{ \sf \: Force = Mass \times Acceleration }$