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Question
Give qualitative definition of force on the basic of Newton's first law of motion.
Solution 1
Force is that external cause which can move a stationary object or which can stop a moving object.
Solution 2
According to Newton's first law force is that external agency which tends to change the state of rest or the state of motion of a body.
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Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles carrying charges 20 μC each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The magnitude of the resultant force on the charged particle at A is.
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