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Read the Following Selection
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Strength and Stability
A structure has to be strong enough to hold its load.
A chair is a structure. The person who sits on the chair is the load. If the chair is not strong enough, the chair will break when someone sits on it.
A paper cup does not have to be nearly as strong as a building. The liquid in a paper cup does not weigh very much.
We say that a structure is stable when the structure can keep its balance and stay in place.
It is easy to keep your balance when you stand on two feet. Standing on two feet keeps you stable. Keeping your balance when you stand on one foot is harder. When you stand on one foot, you are not as stable.
You might sway back and forth, so your body does not stay in place.
Have you ever tried to create a very tall stack of nickels? When the stack is short (less than 25 nickels), it is stable. The stack does not sway or jiggle much when you add nickels. Once the stack has about 40 nickels, it jiggles and sways much more. A short stack of nickels is more stable than a tall stack of nickels.
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Tanya’s mom built a simple step to help her reach things on high shelves. She nailed a thin piece of wood on top of two thick blocks of wood. Then she stood on the step.
1. The step is strong. True or false?CorrectIncorrect
2. The step is stable. True or false?CorrectIncorrect
3. Fill in the blank using information from the text.
A structure has to be to hold its load.
4. What does a tall stack of nickels that sway and jiggle tell you?CorrectIncorrect
5. Is it more stable to stand on one or two feet?CorrectIncorrect