The unit of force is kg ms -2 or Newton, which has the symbol N (newton). The unit of force is chosen in such a way that the value of the constant, k becomes equivalent to 1.įor this, one unit of force is defined as the amount that produces an acceleration of 1 ms -2 in an object of 1 kg mass.ġ unit of force = k × (1 kg) × (1 m s -2). The quantity, k is assumed to be a constant of proportionality. Since, force applied is proportional to rate of change of momentum,Ī =, which is the acceleration which is the rate of change of velocity. The initial and final momentum of the object will be, It is uniformly accelerated to velocity, v in time, t by the application of a constant force, F throughout the time, t. Let us consider an object of mass, m to be moving along a straight line with an initial velocity, u m/s. By the second law of motion, the time rate of change of momentum is equal to the force acting on the particle. Momentum can be considered to be a vector quantity, that is, it has both an associated magnitude as well as direction. Momentum of a body is the product of the mass of the body and its associated velocity. The rate of change of momentum of an object is proportional to the applied force.įorce∝\frac The rate of change of momentum of an object is proportional to the applied unbalanced force, in the direction of force. Isaac Newton’s second law of motion gives the relationship between the force and acceleration of any object in the universe. The third law states that when one object applies a force on a second object, the second object exerts a force back on the first object that is equal in magnitude and opposite in direction.The second law states that the rate of change of momentum of a body is directly proportional to the force applied for any object of constant mass.Law of Inertia – Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by an external acting force.The following are the Newton’s Laws of Motion : In comparison, the motion of minutely small atomic and sub-atomic objects is covered under the branch of quantum mechanics, stipulated by Euler. The branch of physics dealing with the simulated motions of all large-scale and familiar bodies in the universe, for instance, the cars, planets, and humans comes under classical mechanics, stipulated by Newton.
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