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प्रश्न
State the principle of moments. Give one device as an application of it
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उत्तर
According to the principle of moments, if the algebraic sum of moments of all the forces acting on the body about the axis of rotation is zero, the body is in equilibrium. A physical balance (or beam balance) works on the principle of moments.
संबंधित प्रश्न
State two conditions for a body acted upon by several forces to be in equilibrium.
What do you mean by the state of equilibrium? What are the conditions for stable equilibrium?
Give scientific reason for the following:
In a moving bus the standing passenger stands keeping both his legs apart.
A faulty balance of equal arms but pans of unequal weight is used to find the weight of a body. By the method of double weighing the weights are found as 8 kg and 8.2 kg. Find the actual weight of the body.
In figure, a uniform bar of length l m is supported at its ends and loaded by a weight W kgf at its middle. In equilibrium, find the reactions R1 and R2 at the ends.
`["Hint:" "In equilibrium" "R"_1 + "R"_2 = "W" "and" "R"_1 xx l/2 = "R"_2 xx l/2]`
Define the term momentum.
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A non uniform beam of weight 120 N pivoted at one end is shown in the diagram below. Calculate the value of F to keep the beam in equilibrium.
