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Year 7–8 · Year 7–8 Science

Year 7–8 Science — The Physical World

The physical world strand covers forces, motion and energy — concepts that form the basis of Year 9–10 Physics and ultimately VCE Physics. Understanding balanced and unbalanced forces, calculating speed and recognising energy types are the key skills at this level.

Key Concepts & Formulas

  • Force: a push or pull that can change an object's speed, direction or shape; measured in Newtons (N)

  • Balanced forces: forces are equal and opposite; object remains stationary or at constant velocity

  • Unbalanced (net) force: causes a change in motion — speeding up, slowing down or changing direction

  • Speed = distance / time (m/s); distance–time graphs: gradient = speed; flat line = stationary

  • Common forces: gravity (weight), friction, normal force, air resistance, applied force

  • Energy types: kinetic (motion), gravitational potential (height), elastic potential (springs), chemical, thermal, electrical, sound, light

  • Law of conservation of energy: energy cannot be created or destroyed, only transferred or transformed

  • Energy transformation: e.g. a ball falling converts gravitational PE → kinetic energy

  • Waves transfer energy without transferring matter; transverse waves oscillate perpendicular to direction of travel (light); longitudinal waves oscillate parallel (sound)

Practice Questions

4 questions

Attempt each question before reading the hint. These are styled to match school assessment format.

Q1.A car travels 240 km in 3 hours. Calculate its average speed in km/h.

1 mark

Q2.A book rests on a table. Draw a force diagram and explain why it does not accelerate.

3 marks

Q3.List the energy transformations in a torch (flashlight) from chemical energy to light.

2 marks

Q4.Explain the difference between a transverse and a longitudinal wave. Give one example of each.

4 marks

Common Mistakes to Avoid

These are the errors that students most frequently make in The Physical World — and that examiners are specifically watching for.

  • Confusing speed (scalar, magnitude only) with velocity (vector, has direction) — at this level focus on speed

  • Saying objects "have" a force — objects experience forces; they have energy or momentum

  • Thinking friction always opposes all motion — friction opposes RELATIVE motion between surfaces; it can also enable motion (e.g. walking)

  • Saying energy is "used up" — energy is always conserved; it is transformed or transferred, not destroyed

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