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Forces & Engineering

Grade 4 · On-level practice · 8 questions · Version PG-1N5GK8P-1L2J

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1.Explain “iteration” in your own words.
2.Explain “constraint” in your own words.
3.Explain “kinetic energy” in your own words.
4.Explain “momentum” in your own words.
5.Explain “prototype” in your own words.
6.Explain “efficiency” in your own words.
7.Explain “mechanical advantage” in your own words.
8.Explain “electromagnet” 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 12
  1. Explain “iteration” in your own words.repeatedly testing and improving a design
  2. Explain “constraint” in your own words.a limit a design must satisfy
  3. Explain “kinetic energy” in your own words.energy an object has because of motion
  4. Explain “momentum” in your own words.mass multiplied by velocity
  5. Explain “prototype” in your own words.an early model used to test a design
  6. Explain “efficiency” in your own words.useful output divided by total input
  7. Explain “mechanical advantage” in your own words.the factor by which a machine multiplies force
  8. Explain “electromagnet” in your own words.a magnet created by electric current

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.