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LearnCambridge97092026–2027Paper 4 · MechanicsNewton's laws of motion

Paper 4 · Module

Newton's laws of motion

4 subtopics≈ 140 min in total

Start the module: Newton’s laws and F = ma Open graphing calculator

Newton’s laws and F = ma
Resultant force equals mass times acceleration. It links the forces on an object to how its motion changes, and with suvat it lets you predict exactly where the object will be.
≈ 35 min
Motion on inclined planes
Gravity pulls along the slope with $mg\sin\alpha$ ; friction, if any, opposes the motion with $\mu mg\cos\alpha$ . Put them into $F=ma$ along the slope, then let suvat finish the job.
≈ 35 min
Connected particles and pulleys
Two objects joined by a taut string move together with the same acceleration. Write $F=ma$ for each one (or for the whole system) and solve for the acceleration and the tension.
≈ 40 min
Lifts and vertical motion
Why you feel heavy as a lift sets off upwards and light as it slows: the floor pushes with $R=m(g+a)$ . The same $F=ma$ handles cables, parachutes and anything else moving up or down.
≈ 30 min