MYP Physics: Work, Energy & Power — What Students Need to Know

You need three formulas — work done (W = Fd), kinetic energy (KE = ½mv²) and power (P = W/t) — plus the ability to link them through the principle of conservation of energy. MYP assessment focuses less on memorising equations and more on applying them to real scenarios and explaining energy transfers using correct scientific language.

Work done equals force multiplied by distance moved in the direction of the force: W = Fd, measured in joules. If a 20 N force pushes a box 5 metres, the work done is 100 J. Work is only done when the object actually moves — pushing against an immovable wall does zero work, however hard you push.

Kinetic energy (KE = ½mv²) is energy of motion — a moving car, a falling ball, a spinning wheel all have it. Gravitational potential energy (GPE = mgh) is stored energy due to position in a gravitational field, like a book on a high shelf. As height drops, GPE converts to KE.

Power is the rate of doing work: P = W/t, measured in watts, where 1 watt equals 1 joule per second. A motor that does 500 J of work in 10 seconds has a power output of 50 W. Power tells you how quickly energy is transferred, not how much total energy is involved.

The law states that energy cannot be created or destroyed, only transferred between forms — total energy in a closed system stays constant. In MYP Physics, you'll apply this to explain why a swinging pendulum slows down (energy lost to air resistance and friction as heat) rather than losing energy outright.

The biggest one: mixing up energy (joules, total amount) with power (watts, rate of transfer) — students often use the wrong formula because they haven't identified which quantity the question actually asks for. Second most common: forgetting that work is only done when there's movement in the direction of the force.

It's assessed mainly through Criterion C (Processing and evaluating) and Criterion D (Reflecting on the impacts of science), alongside Criterion A for scientific knowledge. Expect data-based questions on real systems — engines, roller coasters, renewable energy — where you calculate values and then explain the physics behind the numbers in full sentences.

Top-band MYP responses combine accurate calculations with genuine scientific explanation — not just the right number, but why it's right. I tell every student I coach: show your formula, substitute values with units, then add one sentence linking the answer back to the energy transfer actually happening in the scenario.

Start with the three core formulas until you can write them from memory with correct units, then move straight to mixed practice questions that force you to decide which formula applies. Past assessment tasks from your school and topic-specific worksheets on RevisionPrep's MYP Physics hub work well for this stage.

Yes — MYP-style questions typically present a real scenario (a cyclist, a crane, a hydroelectric dam) with data tables and ask you to calculate a value, then explain the underlying energy transfer or evaluate the system's efficiency. They rarely ask for a bare formula recall in isolation.

MYP covers the foundational formulas and qualitative understanding of energy transfer; DP Physics (Topic 2: Mechanics) builds on this with vectors, work done at an angle (W = Fd cos θ), and more rigorous treatment of energy conservation in systems involving springs, collisions and circular motion.

Most students struggle here because energy and power sound similar but mean different things mathematically — it's a conceptual mix-up, not a maths problem. The best help at home is asking your child to explain a calculation out loud in plain English; if they can't, they've memorised the formula without understanding it.

Yes — a solid grasp of energy and power at MYP level feeds directly into DP Physics, DP Chemistry (thermodynamics) and even DP Environmental Systems and Societies. Students who go into DP Physics without this foundation typically struggle with Topic 2 (Mechanics) and Topic 3 (Thermal physics) from week one.