Second Grade · Science · week 8

Design: best boat material

Design, test, and compare boats made from different materials to find which one floats and holds the most weight.

Engineers test different materials before choosing one for a real job, and building a boat is a perfect test. A good boat material needs to be waterproof, so it does not soak up water and sink, and rigid enough to hold a boat shape.

This week you become the engineer. You will build small boats from different materials, float them in water, and add pennies one at a time to see which boat holds the most weight before it sinks.

📋 For the teacher
Teach it (10–15 min):
  • Help fold or shape two or three boats from different materials, such as foil, paper, and plastic wrap.
  • Float them in a sink or tub and add pennies one at a time to each, counting out loud together.
  • Ask for a prediction before the test, and compare honestly to the real result afterward.
  • Celebrate the material that failed too; noticing why it failed is real engineering learning.
Talk about it:
  • Which material made the best boat, and why do you think it won?
  • What happened to the paper boat over time?
  • What would you change if you built your boat again?

Mastery looks like: They design, float, and load-test at least two boats made from different materials and explain which material worked best and why.

Common stumbles: Choosing a material because it looks nice rather than testing it; not noticing that a material can start out floating and still fail once it gets wet.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Science for this learner.
← Back to todayAll coursesYear planner