Physics has a strange quality: a topic can feel impossible on Monday and obvious by Friday. The difference is almost never intelligence. It is whether the student found the one picture or example that made the idea click.
Forces are a good example. Students can recite "a resultant force causes acceleration" and still not feel it. Push a shopping trolley, then push it with shopping in it, and the same words suddenly mean something: more mass, same push, less acceleration. Physics is a subject about the real world, and it is learned best through the real world.
The second blocker is maths in disguise. Many physics struggles are actually struggles with rearranging equations, handling units, or reading graphs. Fix the maths step and the physics step often falls into place on its own. A good tutor checks which of the two is actually stuck before re-teaching the physics.
Third, learn the definitions properly. In physics, words like "force", "energy" and "pressure" have precise meanings that differ from everyday use. Exam marks are lost not because students do not understand, but because they describe things loosely. Saying "the force" when the question asks about pressure, or "heat" when it means thermal energy, costs marks a precise student keeps.
Practical tip for revision: for each topic, write the idea in one sentence, draw it, and do one calculation. Idea, picture, number. If your child can do all three without notes, they know the topic.
Physics rewards the student who asks "but why does that happen?" — and a tutor who answers with a demonstration rather than a definition. Compare verified physics tutors on London Tutors and book a trial lesson.