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Forces & Engineering

Grade 5 · Stretch challenge · 8 questions · Version PG-OG3WX5-1GRU

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1.Explain “potential energy” in your own words.
2.Explain “prototype” in your own words.
3.Explain “efficiency” in your own words.
4.Explain “momentum” in your own words.
5.Explain “constraint” in your own words.
6.Explain “Newton's third law” in your own words.
7.Explain “mechanical advantage” in your own words.
8.Explain “iteration” in your own words.

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 11
  1. Explain “potential energy” in your own words.stored energy based on position or condition
  2. Explain “prototype” in your own words.an early model used to test a design
  3. Explain “efficiency” in your own words.useful output divided by total input
  4. Explain “momentum” in your own words.mass multiplied by velocity
  5. Explain “constraint” in your own words.a limit a design must satisfy
  6. Explain “Newton's third law” in your own words.forces occur in equal and opposite pairs
  7. Explain “mechanical advantage” in your own words.the factor by which a machine multiplies force
  8. Explain “iteration” in your own words.repeatedly testing and improving a design

Worked example

Identify forces, constraints, and evidence from a test before revising a design.

Common mistake

Changing several variables at once and losing a fair comparison.

Helpful hint

Change one feature and measure the result.