Question

1st 2nd 3rd law of motion with its si unit define one newton

Answer 1

First law of motion-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 uniforms motion.
Second law of motion-the rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts.
Third law of motion-every action has equal and opposite reaction. The SI unit of force is Newton which is denoted by N

Answer 2

Newton's First Law

An object does not change its state of rest or  uniform motion by its own. The inability of any object to change its state is called inertia. Newton’s first law of motion gives the concept of inertia and force . According to the law, any object in the universe remains in its state of rest or uniform motion. Inertia is of three types, namely Inertia of rest, Inertia of motion and Inertia of direction. Mass of an object is an intrinsic property of matter.

Mass is a measure of inertia of an object. If an object does not change its position with respect to time and the surroundings, it is said to be at rest and else it is said to be in motion. The rate of change in displacement of an object is called velocity. If an object covers equal displacements in equal intervals of time, the motion is called uniform motion, else it is non-uniform motion.

Newton's Second Law

When a cricketer catches a ball he moves his hand back while catching the ball. He does this to reduce the impact, due to the force of the ball on his hand. Force needed to stop a moving body in a definite time depends both on the mass and the velocity of the body  so the force needed to stop a moving body in a time depends on the product of bothe mass and velocity. An object in motion has momentum.

Momentum is defined as the product of mass and velocity of an object. The momentum of the object at the starting of the time interval is called the initial momentum and the momentum of the object at the end of the time interval is called the final momentum. The rate of change of momentum of an object is directly proportional to the applied force.

Newton's second law quantifies the force on an object. The magnitude of force is given by the equation,

F = ma, where 'm' is the mass of the object and 'a' is its acceleration. The CGS unit of force is dyne and the SI unit is newton (N). The force acting on a body causes a change in its momentum. In fact, according to Newton’s second law of motion, the rate of change in the momentum of a body is equal to the net external force acting on it.

Newton's Third Law

For every action, there is an equal and opposite reaction is Newton’s third law of motion. This tells us that all forces in nature acts in pairs. These actions and reactions help in understanding the motion of bodies on which forces act. The law also helps in resolving issues in several applications of forces, namely when two bodies collide. The momentum of the bodies before collision and after collision can be worked out using the third law.

Third law of motion-every action has equal and opposite reaction. The SI unit of force is Newton which is denoted by N

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