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formulae for motion of bodies in motion

geethika , 9 Years ago

Grade 11

2 Answers

Gayatri Jayesh Bondriya

Last Activity: 9 Years ago

First law:	When viewed in an internal refrance frame , an object either remains at rest or continues to move at a constant velocity unless acted upon by an external force
Second law:	The vector sum of the external forces F on an object is equal to the mass m of that object multiplied by the accleration vector a of the object: F = ma.
Third law:	When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

Gayatri Jayesh Bondriya

Last Activity: 9 Years ago

The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant.

The second law states that the net force on an object is equal to the rate of change of its linear momentomm p in an internal refrance frame

$\mathbf{F} = \frac{\mathrm{d}\mathbf{p}}{\mathrm{d}t} = \frac{\mathrm{d}(m\mathbf v)}{\mathrm{d}t}.$

The second law can also be stated in terms of an object's acceleration. Since Newton's second law is only valid for constant-mass systems mass can be taken outside the diffrenciation operator . Thus,

_BF = −_AF, and the two forces are equal and opposite: A on _BF simultaneously exerts a force B, then B on a second object _AF exerts a force AThe third law states that all forces between two objects exist in equal magnitude and opposite direction: if one object $\mathbf{F} = m\,\frac{\mathrm{d}\mathbf{v}}{\mathrm{d}t} = m\mathbf{a},$