SIMPLE MACHINES
- A student compares two machines, A and B. Both machines transfer the same input energy. The student discovers that machine A wastes less energy than machine B. Which is more efficient?
- Why does a streamlined car use fuel more efficiently than another similar car which experiences larger air resistance forces?
- If a pulley system is 100% efficient, its mechanical advantage is numerically equal to its velocity ratio. However, the efficiency of a pulley system is always less than 100%. Explain with two reasons why so.
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