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Year 9–10 · Year 9–10 Science

Year 9–10 Science — Physics

Year 9–10 physics introduces quantitative concepts — calculating work, power and understanding electrical circuits — that build directly into VCE Physics. The jump from qualitative ("electricity flows") to quantitative ("the current is 2 A") is the key transition at this level.

Key Concepts & Formulas

  • Work: W = F × d (joules, J) — work is done when a force moves an object in the direction of the force

  • Power: P = W / t = E / t (watts, W) — the rate at which energy is transferred or work is done

  • Kinetic energy: Eₖ = ½mv² (joules); gravitational potential energy: Eₚ = mgh (joules)

  • Conservation of energy: total energy is constant; Eₖ and Eₚ can be converted into each other

  • Electric current: rate of flow of charge; measured in amperes (A); I = Q/t

  • Voltage (potential difference): energy per unit charge; measured in volts (V)

  • Resistance: opposition to current flow; measured in ohms (Ω); V = IR (Ohm's Law)

  • Series circuit: same current throughout; voltages add; total resistance = sum of individual resistances

  • Parallel circuit: same voltage across each branch; total current = sum of branch currents

  • Electromagnetic spectrum (increasing wavelength): gamma rays, X-rays, UV, visible light, infrared, microwaves, radio waves

Practice Questions

5 questions

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

Q1.A person applies a force of 150 N to push a box 4 m along the floor. Calculate the work done.

1 mark

Q2.A 60 W light bulb is left on for 2 hours. Calculate the energy used in joules.

2 marks

Q3.A 12 V battery is connected to two resistors of 4 Ω and 8 Ω in series. Find the current and the voltage across each resistor.

4 marks

Q4.A ball of mass 0.5 kg is dropped from a height of 10 m. Find its kinetic energy just before it hits the ground. (g = 10 m/s²)

2 marks

Q5.Identify which part of the electromagnetic spectrum is used for (a) medical imaging of bones and (b) TV remote controls.

2 marks

Common Mistakes to Avoid

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

  • Confusing power (rate of energy use) with energy (total amount used) — a 100 W bulb uses 100 J every second

  • Using the wrong formula: W = Fd calculates work; P = W/t calculates power — don't swap them

  • Applying series resistance formula to parallel circuits — always identify the circuit type first from a diagram

  • Forgetting to convert units: 2 hours = 7200 seconds when calculating energy

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