Free Printable WorksheetScienceGrade 7Science CurriculumMS-PS1-2

7.75 Density and Buoyancy Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 7 Science worksheet provides structured practice on 7.75 Density and Buoyancy. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Density and Buoyancy - Which object will float or sink based on calculated densities in a given fluid? (NGSS MS‑PS1‑2 connections; IXL D)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 7

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 7.75 Density and Buoyancy skill assessments:

Problem 1Difficulty: Mastery
A rescue buoy has a volume of 3.0 L and a mass of 2.4 kg. How much additional mass can it support in freshwater before it becomes neutrally buoyant? Answer in grams.
Solution & Explanation:A 3.0 L buoy displaces 3000 g of freshwater when fully submerged. Since the buoy itself has mass 2400 g, it can support 600 g more before becoming neutrally buoyant.
Problem 2Difficulty: Mastery
During a lab, students find that a thin metal shell floats even though metal is usually denser than water. Which idea best explains the result?
AThe shell stops having mass when it is sealed.
BThe shell's overall average density, including the trapped air, is less than water.
CAll metal becomes less dense in cool water.
DBuoyancy depends only on shape and never on density.
Solution & Explanation:A hollow shell can trap air and spread its mass over a larger volume. That can make the shell's average density less than water, allowing it to float.
Problem 3Difficulty: Mastery
A 600 g science instrument is placed in a sealed foam case. The foam adds 50 g of mass and 500 mL of volume. The instrument itself occupies 200 mL of volume. Will the sealed case float in freshwater?
AYes, but only in saltwater.
BYes, because the total density is about 0.93 g/mL.
CNo, because foam cannot support heavy objects.
DNo, because the instrument mass is more than 500 g.
Solution & Explanation:The total mass is 650 g and the total volume is 700 mL. Density = 650 / 700, about 0.93 g/mL, so the sealed case floats in freshwater.

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Frequently Asked Questions

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QIs this 7.75 Density and Buoyancy worksheet free for teachers and homeschoolers?

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 7 Science students. It aligns with educational standard MS-PS1-2 (Primary standard selected for prompt fields in this prompt cell: NGSS MS-PS1-2. Skill statement in this prompt cell: Which object will float or sink based on calculated densities in a given fluid? Associated standards listed with this skill in this prompt cell: NGSS MS-PS1-2 connections; IXL D. Use this prompt-provided wording as the supporting standard description for this workflow.).

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