Independent and Dependent variables worksheet - Free Printable

To solve the problem of identifying independent variables (I), dependent variables (D), and constants (C) in each scenario, we need to analyze each situation carefully. Here's a breakdown of each item:

1. A study was done to find if different tire treads affect the braking distance of a car.

- Independent Variable (I): Tire treads
- Dependent Variable (D): Braking distance
- Constants (C): Car model, road surface, speed of the car, weather conditions

2. The time it takes to run a mile depends on the person’s running speed.

- Independent Variable (I): Running speed
- Dependent Variable (D): Time to run a mile
- Constants (C): Distance (1 mile), runner's physical condition, terrain

3. The height of bean plants depends on the amount of water they receive.

- Independent Variable (I): Amount of water
- Dependent Variable (D): Height of bean plants
- Constants (C): Type of bean plant, soil quality, sunlight exposure, temperature

4. The higher the temperature of the air in the oven, the faster a cake will bake.

- Independent Variable (I): Temperature of the oven
- Dependent Variable (D): Baking time of the cake
- Constants (C): Cake recipe, size of the cake, humidity in the oven

5. Lemon trees receiving the most water produced the most lemons.

- Independent Variable (I): Amount of water
- Dependent Variable (D): Number of lemons produced
- Constants (C): Type of lemon tree, soil quality, sunlight exposure, fertilizer

6. An investigation found that more bushels of potatoes were produced when the soil was fertilized more.

- Independent Variable (I): Amount of fertilizer
- Dependent Variable (D): Bushels of potatoes produced
- Constants (C): Type of potato plant, soil type, rainfall, sunlight exposure

7. Students measured the temperature of the water at different depths in Lake Skywalker and found that the temperature varied.

- Independent Variable (I): Depth of the water
- Dependent Variable (D): Temperature of the water
- Constants (C): Time of measurement, location in the lake, atmospheric conditions

8. The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead.

- Independent Variable (I): Amount of lead in gasoline
- Dependent Variable (D): Amount of pollution produced
- Constants (C): Type of car, driving conditions, fuel efficiency, distance driven

9. Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After 3 weeks on the diet, the rats’ masses are measured again to see if there has been a decrease.

- Independent Variable (I): Amount of vitamin A in the diet
- Dependent Variable (D): Rats' masses after 3 weeks
- Constants (C): Initial masses of rats, type of diet (except vitamin A), duration of the experiment, living conditions

Final Answers:

1. I: Tire treads, D: Braking distance, C: Car model, road surface, speed of the car, weather conditions
2. I: Running speed, D: Time to run a mile, C: Distance (1 mile), runner's physical condition, terrain
3. I: Amount of water, D: Height of bean plants, C: Type of bean plant, soil quality, sunlight exposure, temperature
4. I: Temperature of the oven, D: Baking time of the cake, C: Cake recipe, size of the cake, humidity in the oven
5. I: Amount of water, D: Number of lemons produced, C: Type of lemon tree, soil quality, sunlight exposure, fertilizer
6. I: Amount of fertilizer, D: Bushels of potatoes produced, C: Type of potato plant, soil type, rainfall, sunlight exposure
7. I: Depth of the water, D: Temperature of the water, C: Time of measurement, location in the lake, atmospheric conditions
8. I: Amount of lead in gasoline, D: Amount of pollution produced, C: Type of car, driving conditions, fuel efficiency, distance driven
9. I: Amount of vitamin A in the diet, D: Rats' masses after 3 weeks, C: Initial masses of rats, type of diet (except vitamin A), duration of the experiment, living conditions

These answers should help you fill out the worksheet accurately. Let me know if you have further questions!