Physics Exam Prep
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Physics Exam Prep
Sample questions with model answers
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Hence derive an expression for the potential energy of an elastic stretched spring.
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The potential energy \( U = rac{1}{2} k x^2 \) where \( k \) is the spring constant and \( x \) is the displacement.
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Show that in case of one dimensional elastic collision of two bodies, the relative velocity of separation after the collision is equal to the relative velocity of approach before the collision.
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For elastic collisions, \( v_1 - v_2 = -(u_1 - u_2) \) holds true.
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Show that the elastic force of a spring is a conservative force.
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The work done by the elastic force is path-independent, confirming it is conservative.
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The force required to just move a body up an inclined plane is double the force required to prevent the body from sliding down. Find the coefficient of friction.
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The coefficient of friction is 0.5.
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