Question

State Newton's third law of
motion and write
any three applications of it:

Answer 1

Answer:

According to the Newton's third law of motion, "To every action there is an equal but opposite reaction".

Answer 2

In short

Newton's third law states that for every action there is an equal and opposite reaction. As you stand on the ground, your body push on the earth with a force, and the earth reacts on your body with the same force in opposite direction.

In long

Newton’s third law: the law of action and reaction

Newton’s third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. The third law is also known as the law of action and reaction. This law is important in analyzing problems of static equilibrium, where all forces are balanced, but it also applies to bodies in uniform or accelerated motion. The forces it describes are real ones, not mere bookkeeping devices. For example, a book resting on a table applies a downward force equal to its weight on the table. According to the third law, the table applies an equal and opposite force to the book. This force occurs because the weight of the book causes the table to deform slightly so that it pushes back on the book like a coiled spring.

If a body has a net force acting on it, it undergoes accelerated motion in accordance with the second law. If there is no net force acting on a body, either because there are no forces at all or because all forces are precisely balanced by contrary forces, the body does not accelerate and may be said to be in equilibrium. Conversely, a body that is observed not to be accelerated may be deduced to have no net force acting on it.

Applications :

(i) Rocket propulsion : fire of gases exit from downward and generate thrust force as a reaction to push rocket upward.

(ii) Satellites orbiting around the planets : orbiting satellites are having gravitational pull toward the center of plant and centripetal force is a reaction force to rotate it around planet.

(iii) Gun shot : shot from the gun push the person back due to reaction force as bullet will be moving in forward direction.

. (iv) Aeroplane thrust : propeller of aeroplane generate thrust for lifting and moving.