Question

All formula of force and laws of motion class 9th

Answer 1

Force

The formula for force is equal to mass(m) and multiplied by acceleration(a).

F=m×a

Laws of motion

1.) The first law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force .

2.) The second law states that the remate change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts .

3.) The third law states that for Every action in nature there is a equal and opposite reaction.

Answer 2

Force = Mass × acceleration

Force= Rate of change of momentum = m(v-u)/t

Force = Pressure × Area in contact

S = ut + 1/2at²

V = u + at

V² = u² + 2as

For bodies thrown upwards,

H = ut - 1/2gt²

V = u -gt ( here V = 0 ) So,

U = gt from here we get

Time of ascend (t) = U/g

Time of descend (t) = U/g

Total time of flight = 2U/g.

Hope it helps....