Variable Sleuth Bell Work Worksheet
Daily Warm-Up Est. Time: 5–7 min
Variable Sleuth Bell Work
Name:
Period:
Date:
1
Term Match-Up
(Write letter in blank)
1. Independent Variable
2. Dependent Variable
3. Controlled Variable
4. Hypothesis
A. Kept identical across trials for a fair test.
B. Measured outcome recorded as experimental data.
C. Intentionally changed by the experimenter.
D. Testable prediction using "If... then... because...".
2
Check Your Understanding
(Circle the best choice)
Q1: Which is a scientific, testable question?
A Do plants look prettier in purple flower pots?
B Does fertilizer type affect bean plant height?
C Why is natural sunlight superior to fluorescent light?
D Is gardening the best hobby for middle schoolers?
Q2: Why must a scientist change only one variable at a time?
A To complete lab observations much more quickly.
B To isolate which specific factor caused the result.
C Because measuring devices only read one unit.
D To guarantee that the initial hypothesis is proven right.
3
Lab Scenario Detective
Scenario: The Paper Rocket Challenge
Maya tests whether fin shape affects rocket distance. She crafts 3 rockets with identical length and mass: Rocket A (triangular fins), Rocket B (square fins), and Rocket C (curved fins). She launches each rocket 5 times using the same air launcher at 45° and records flight distance in meters.
Independent Variable
What did Maya change?
Dependent Variable
What was measured?
Controlled Variable
1 condition kept constant:
Construct Maya's Hypothesis:
Format: If... then... because...
Write a formal prediction explaining how fin shape influences flight distance:
IF:
THEN:
BECAUSE:
Self-Check: Did you identify 1 changed factor, 1 measured factor, and at least 1 constant?
Yes
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