Concept explainers
Hydraulic devices multiply forces. Why does this not violate the law of conservation of energy?
To explain: Hydraulic devices did not violate the law of conservation of energy.
Explanation of Solution
Introduction:
Pascal’s law:
The pressure in all direction of container is equal.
The hydraulic devices obeys law of conservation of energy because a decrease in distance moved is balanced by increase in force. When there is downward movement of small piston by 10cm, due to this movement of small piston large piston will get moved bye only 2cm. Product of input force and distance moved in downward direction by smaller piston is equal to product of distance moved in upward direction by larger piston and output force. And we know that work(energy) is product of force and displacement. It means input energy will be equal to output energy. In this way law of conservation of energy will be obeyed by hydraulic devices.
Conclusion:Hydraulic devices follows the law of conservation of energy.
Chapter 19 Solutions
Conceptual Physics: The High School Physics Program
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