Physics is full of ideas that feel intuitive but are scientifically wrong. Here are the most common GCSE Physics misconceptions — and what to do about them.
Physics is arguably the subject where intuition is most likely to lead students astray. The way the world appears to work and the way it actually works are often different — and GCSE Physics asks students to set aside their everyday experience and think scientifically.
These are some of the most common misconceptions to watch out for.
"Heavier objects fall faster"
This is perhaps the most famous Physics misconception of all, disproved by Galileo and dramatically demonstrated by the hammer-and-feather experiment on the Moon. In the absence of air resistance, all objects fall at the same rate regardless of mass. Students who hold this belief will struggle with questions about forces, gravity and terminal velocity.
"Forces are needed to keep objects moving"
Aristotelian thinking — the idea that a force is required to maintain motion — is deeply intuitive and deeply wrong. Newton's First Law tells us that objects continue moving at constant velocity unless acted on by a resultant force. Confusion here affects almost every topic in forces and motion.
"Current is used up as it flows around a circuit"
Many students think that components in a circuit consume current, leaving less for later components. Current is not used up — energy is transferred, but the same current flows throughout a series circuit. This misconception leads to systematic errors in circuit questions.
"The Sun is on fire"
Students picture combustion when they think of the Sun producing energy. The Sun generates energy through nuclear fusion, not combustion. Fusion involves hydrogen nuclei combining to form helium, releasing enormous amounts of energy. This is a key distinction in questions about stars and nuclear physics.
"Radiation always means nuclear radiation"
The word radiation covers a much broader range of phenomena than nuclear emission. Light is radiation. Heat transfer by infrared is radiation. The electromagnetic spectrum is radiation. Students who treat radiation as synonymous with nuclear danger will misread questions and lose marks across multiple topics.
Why Physics misconceptions are so sticky
Many Physics misconceptions come from genuine everyday experience. Objects do seem to slow down without being pushed. Things that are heavier do seem to hit the ground first. The challenge for teachers is that these ideas are grounded in a version of reality — they just don't account for air resistance, friction or the conditions under which scientific laws apply.
The most effective approach is to make the misconception explicit, test it, and give students a concrete moment where their existing model fails. That failure is what creates space for new understanding.
Resources to help:
Our GCSE Physics Misconceptions Pack covers the full AQA specification with sorting activities, answer reveals and Sticky Knowledge slides for every topic. Available individually or as part of the GCSE Science Misconceptions Bundle.