Grade 5 Identifying Variables Worksheets 2024 - Free Printable

Let’s go through each question one by one. For each, we’ll write a simple hypothesis or prediction based on what we know about how variables work in experiments.

Remember:
- The independent variable is what you change on purpose.
- The dependent variable is what you measure (it changes because of the independent variable).
- A hypothesis is your best guess about what will happen — usually written as “If… then…”

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1. How does the distance from an eye chart affect the number of letters that are recognized on a line?

→ If you move farther away from the eye chart, it gets harder to see the letters. So you’ll probably recognize fewer letters.

Hypothesis/Prediction:
*If the distance from the eye chart increases, then the number of letters recognized will decrease.*

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2. How does the amount of light affect the growth of a plant?

→ Plants need light to make food and grow. More light usually means more growth — up to a point.

Hypothesis/Prediction:
*If the amount of light increases, then the plant will grow taller or bigger.*

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3. How does the amount of oxygen in the water affect the oyster population?

→ Oysters need oxygen to breathe. If there’s less oxygen, they might not survive well.

Hypothesis/Prediction:
*If the amount of oxygen in the water decreases, then the oyster population will also decrease.*

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4. How will the amount of fertilizer used on a field affect the number of earthworms found there?

→ Too much fertilizer can hurt soil life, including earthworms. Earthworms like healthy soil with natural nutrients.

Hypothesis/Prediction:
*If too much fertilizer is added, then the number of earthworms will decrease.*

*(Note: Some fertilizer might help at first, but generally, excess harms worms.)*

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5. How does the length of a string affect the number of times a pendulum will swing back and forth in 10 seconds?

→ Shorter strings make pendulums swing faster. Longer strings make them swing slower.

Hypothesis/Prediction:
*If the string is shorter, then the pendulum will swing more times in 10 seconds.*

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6. How does the size of a bicycle tire affect the distance it will travel when it is pedaled a given number of times?

→ Bigger tires cover more ground with each turn. So for the same number of pedals, bigger tires = more distance.

Hypothesis/Prediction:
*If the tire size increases, then the distance traveled will also increase.*

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Final Answer:

1. If the distance from the eye chart increases, then the number of letters recognized will decrease.
2. If the amount of light increases, then the plant will grow taller or bigger.
3. If the amount of oxygen in the water decreases, then the oyster population will also decrease.
4. If too much fertilizer is added, then the number of earthworms will decrease.
5. If the string is shorter, then the pendulum will swing more times in 10 seconds.
6. If the tire size increases, then the distance traveled will also increase.