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Kitchen Container Pull Tests

Compare kitchen-container tests to explain how balanced and unbalanced forces affect starting, stopping, speed, and direction.

Grade 3ScienceInteractive · Printable

Aligned to3-PS2-1

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What’s included

Single worksheet
Auto-graded online
1 NGSS standard
Printable answer key
13 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 3
Subject: Science
Question types: Fill in the blank, Multiple choice, Circle the answer, Sorting, Short answer

About this worksheet

What students practice

Students use test results to explain how balanced forces can leave an object's motion unchanged.
Students use observations to identify unbalanced forces that change an object's speed or direction.
Students identify fair-test conditions for investigating how forces affect motion.

How to use

Read the investigation together and review the graph labels. Have students use the observations as evidence for their answers; no equipment is needed.

Curriculum

NGSS standard covered

3-PS2-1

Investigate how balanced and unbalanced forces change, or do not change, an object's motion.

Preview

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Kitchen Container Pull Tests

Compare two tubs to investigate how forces affect motion.

Compare the Starting Tests

Read the investigation and graph. Think about forces along the tabletop.

Two Tubs in the School Kitchen

A class investigates two empty plastic food tubs on a kitchen table. Tub A and Tub B are the same size, shape, and weight. A teacher attaches soft pulling loops to opposite sides of each tub. The class uses a clean, dry, flat table with plenty of room away from its edges.

Each trial begins with one tub resting at a marked spot. Two helpers pull gently in opposite directions, left and right. The teacher uses classroom force meters to help the helpers compare their pulls. In the equal-pull test, the leftward and rightward pulls are equally strong. In the stronger-right-pull test, the helpers keep the leftward pull the same but increase the rightward pull.

The class tests each tub five times with each setup. They use the same tabletop and starting spot, and they keep both tubs empty. They record whether the tub starts moving during each trial. In every trial where a tub starts moving, it moves right. The graph shows the class's results. The labels describe the helpers' pulls, not the number of helpers.