What are the forces acting on the ruler when it is balanced at its center of gravity?
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Explanation:
When an object is balanced, it is in a state of equilibrium. Any forces on the object are balanced by forces in the opposite direction. The centre of gravity is the average position of the force of gravity on an object.
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If the ruler is balanced, the support where the ruler is resting exerts a force opposite to its weight of the same magnitude as the weight. So, the forces acting on the ruler are its weight and the reaction force at the support.
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