Isaac Newton was the greatest scientist that had ever lived. The illustrious natural philosopher was born at **Woolsthrope Manor** in **Lincolnshire**. He was one of the greatest thinkers of modern times.

In 1666, the fall of an apple led to his greatest discovery of all - the law of gravitation. He was knighted in 1705. His new ideas had given the great concepts and laws regarding motion and gravitation. His laws of motion could show the clear picture of motion of object when force is applied on the body. Further the concept of gravitation and universal law of gravitation had given the new dimensions to Physics. The queries like why the things fall downwards? & how the universal objects are capable of moving without any forces being applied, have been answered after the development of concept of gravitation. Thus it is called **Isaac Newton Gravity** **theory** which is a world wide well known theory which answered so many queries and helped a lot in the many scientific calculations.

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The first law of motion is related to the law of

Every body continues its state of rest or of uniform motion in a straight line, unless compelled by some external force to act otherwise.

Newton's second law of motion states that rate of change of momentum is
directly proportional to applied force and takes place in the same
direction as the applied force.

According to the second law of motion, F $\propto$ $\frac {dP} {dt}$

where dP is change in momentum and

dt is time taken.

F = $\frac{m(v_{f} - v_{i})}{t} = \frac{m(v_{f} - v_{i})}{t}$

F = $\frac {m(v_{f} - v_{i})} {t}$ = ma

Hence we conclude from second law of motion that when the force is applied on the mass m, then the acceleration is produced in it.

Therefore, a = $\frac {F} {m}$.

Thus, for same force larger acceleration is produced in smaller mass or

we can say that we need larger force to produce the same amount of acceleration in larger mass.

One Newton is the force applied on body of mass 1kg to produce an acceleration of 1m/s

According to the third law of motion

When we shake the tree, the fruits and dry leaves remain at their position due to first law of motion, the inertia resist the motion, so, as the branches shake, they get detached from the tree.

The passengers are in motion due to first law and as the bus suddenly stops due to inertia their upper body opposes the force and continues to remain in motion.

When we push the empty box, it easily moves from its position but when we apply the same force to the filled box, we are unable to move it, this is because the box is filled now and its mass has increased, so, the capacity of box to oppose the external force increases.

Thus, we conclude that the

Thus, by Newton's 2nd law there must be a force that acts on the apple to cause this acceleration. If we call this force "gravity", then the associated acceleration is "

The rocket leaves or exerts fuel with some force, the fuel in return produces an equal force on the rocket, which makes the rocket accelerate in the forward direction.

- 200N
- 500N
- 700N
- 250N
- 60N

F = m x a = 40 x 5

F = 200N

More topics in Newton's Laws of Motion | |

Inertia | Newton's First Law of Motion |

Newton's Second Law of Motion | Newton's Third Law of Motion |

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