Concept explainers
If you know your own weight and have seesaw and a meterstick available, how can you determine the approximate weight of a friend?
The approximate weight of a friend using a person’s weight, a seesaw, and a meter stick.
Answer to Problem 28A
If seesaw bends down the end where first person is sitting, his friend would weigh more. The approximate weight of his friend is
Explanation of Solution
Given: A person and his friend are supposed to use a seesaw to measure his weight using his weight and a meter stick. Let’s say the first person’s weight is
Formula used:
Using Torque equation,
Force applied x Distance from center of symmetry = Constant
Calculation:
In this case, the weight would be the Force applied at the end of the seesaw. Now, to balance the seesaw, if weight is not equal then the product of weight and distance from the center of seesaw must be symmetrical. First person is sitting at
Conclusion:
Thus, the approximate weight of his friend is
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