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## Explain Newtons second law of motion terms of its components of force. Physics Cbse class 11

##### Explain Newtons second law of motion terms of its components of force.

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## Newton's second law of motion:

Newton's first law of motion qualitatively defines the concept of force and the principle of inertia.

For an body at rest, application of force causes a changed in its existing state and application of force on a body moving with uniform velocity would give the body under consideration as acceleration.

Newton's second law of motion is a relation between force and acceleration

Newton's second law of motion says that
" The net force on a body is equal to the product of mass and acceleration of the body"
Mathematically
Fnet=ma                               (1)

Where Fnet is the vector sum of all the forces acting on the body

Above equation -(1) can be resolved along x,y and z components .Thus in component form
Fnetx=max
Fnety=may
Fnetz=maz

Component of acceleration along a given axis is caused only by the net component of force along that axis only not by the components of force along other axis

Newton's second law of motion is completely consistent with newton first law of motion as from equation (1) F=0 implies that a=0

For a body moving under the influence of force, acceleration at any instant is determined by the force at that instant not by the previous motion of the particle

Newton's second law of motion is strictly applicable to a single particle .In case of rigid bodies or system of particles, it refers to total external forces acting on the system excluding the internal forces in the system.

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