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Answer on Mechanics | Relativity Question for noman khan

Question #16499
what is equilibruim and how can we ralate it with newtons laws of motion
Expert's answer
Newton's First law of motion states that everybody continues or tends to be in its state of rest, or of uniform motion, unless it is compelled to change that state by force impressed on it.

This law leads to the definition of inertia & equilibrium. when state of object does not change with time, we say the body is in equilibrium. According to the first law for equilibrium there must be zero force on the object.

Equilibrium can be classified as:

1. Translatory equilibrium:when a body is at rest or moves on a straight line with constant velocity we say that the body is in translatory equilibrium , however several force may be acting on particle in this state, but the resultant force on the object is zero. Thus,

vector R = Summation vector F = 0

represents translatory equilibrium.

2. Rotational equilibrium:When body is not rotating at all or its rotating at constant rate it is said to be in rotational equilibrium. This is Newton's first law of motion,equilibrium.

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