Multiple choice general knowledge science & technology

When a person uses a simple machine, such as a lever or a pulley, the work or energy output from the simple machine becomes (neglect any potential energy that may have been previously stored in the machine) :

  1. higher than the work or energy input by the person

  2. equal to the work or energy input by the person

  3. lower than the work or energy input by the person

  4. both b & c can happen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Due to conservation of energy and friction, some input work is always lost as heat. Therefore output work cannot equal or exceed input work; it must be less than the work put in.

Keep practicing — related questions