While doing work using a machine, one of the following phenomena is always correct.Question 2Answera.The output work is greater, equal or less than the input workb.The output power is greater, equal or less than the input power.c.The output force is less than the input force.d.D. No energy is added by the machine.
Question
While doing work using a machine, one of the following phenomena is always correct.Question 2Answera.The output work is greater, equal or less than the input workb.The output power is greater, equal or less than the input power.c.The output force is less than the input force.d.D. No energy is added by the machine.
Solution
a. The output work is greater, equal or less than the input work
This statement is true because the output work of a machine can never be greater than the input work due to the law of conservation of energy. However, it can be equal to the input work in an ideal machine (which doesn't exist in reality because there's always some energy loss due to friction, heat, etc.). In most real-world cases, the output work is less than the input work due to these energy losses.
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