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Forces & Engineering

Grade 4 · On-level practice · 8 questions · Version PG-3G6JXT-1L2J

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

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.