Motion, Forces and Energy

Motion, Forces and Energy is the largest topic in Cambridge IGCSE Physics 0625. It begins with measurement and motion, then connects forces, turning effects, momentum, energy, work, power and pressure. The ideas build on one another, so learning order matters.

A sensible learning order

Start with quantities, units and motion graphs. Then move into mass, weight, density and forces before studying moments and centre of gravity. Energy, work and power are easier once force and motion are secure. Extended candidates can then add momentum, circular motion and the quantitative Supplement equations.

What usually causes difficulty

Students often know an equation but choose it from the wrong quantities, mix units or skip the link between a graph and the physical motion. Written explanations can also become vague, especially when a question asks for a cause-and-effect chain rather than a definition.

Use the lesson pages in sequence. After each one, attempt an original question without notes and record whether the difficulty was the Physics idea, the mathematics, the units or the wording. That distinction makes the next revision session much more focused.

What to connect across the topic

Speed-time graphs link to acceleration and distance. Forces link to changes in motion. Work links force and distance to energy transfer. Power compares how quickly work is done. Pressure applies force over an area. These connections are more useful than memorising each formula as an isolated fact.

The equations reference, Maths for Physics guide and topic question bank provide the supporting practice for this hub.