SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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work and joules
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force and newton
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power and watt
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potential energy and watt
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Detailed explanation-1: -If the potential energy function U(x) is known, then the force at any position can be obtained by taking the derivative of the potential. Graphically, this means that if we have potential energy vs. position, the force is the negative of the slope of the function at some point.
Detailed explanation-2: -The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
Detailed explanation-3: -According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in the kinetic energy.