Suppose it takes at least 5 people to push a very heavy box up a 400-cm ramp. If there are actually 6 people there to help push, which ramp(s) could they use to get the box moved? (Assume no friction.)

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Explanation: Six people can push with more force than 5 people can. So, if 5 people can push the box up a 400-cm ramp, then certainly 6 people can do it also. Similarly, any ramp that is longer (less steep) than a 400-cm ramp will work, so they can handle the 800-cm ramp. However, the 200-cm ramp is too short and steep. In fact, the 200-cm ramp is half the distance of the 400-cm ramp, so it would take twice as many people (10 people) to push the box up that ramp. Six people is not enough

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

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