Pearson Edexcel International GCSE in Physics · 4PH1
Topic 1 · Forces and motion
How things move and what changes their motion: speed and acceleration, the two motion graphs, Newton's laws, weight, stopping distances, springs, momentum and moments.
10 lessons, covering 33 specification statements: 1.1 · 1.3 · 1.4 · 1.5 · 1.6 · 1.7 · 1.8 · 1.9 · 1.10 · 1.11 · 1.12 · 1.13 · 1.14 · 1.15 · 1.16 · 1.17 · 1.18 · 1.21 · 1.19 · 1.20 · 1.22 · 1.23 · 1.24 · 1.2 · 1.25 · 1.26 · 1.27 · 1.28 · 1.29 · 1.30 · 1.31 · 1.32 · 1.33
The lessons
- Speed, and What a Distance–Time Graph Is Telling You — Speed as a rate, the units physics insists on, and how to read a journey straight off a graph. (1.1, 1.3, 1.4, 1.5)
- Acceleration and the Velocity–Time Graph — What acceleration actually measures, why its unit looks strange, and how one graph gives you both acceleration and distance. (1.6, 1.7, 1.8, 1.9, 1.10)
- Forces, Vectors and Scalars — What a force actually does, why some quantities need a direction to mean anything, and why that makes a force one of them. (1.11, 1.12, 1.13, 1.14)
- Resultant Force, Friction and F = ma — Why a moving object stops, what really happens when you add forces up, and the one equation that connects force to motion. (1.15, 1.16, 1.17)
- Weight and Terminal Velocity — What weight actually is, why it is not the same as mass, and what happens to a falling object once the air starts pushing back. (1.18, 1.21)
- Stopping Distance — Why a car does not stop when you decide to stop it — and which of the two distances each factor actually lengthens. (1.19, 1.20)
- Hooke's Law and Elasticity — Why a spring stretches in proportion to the force — until, quite suddenly, it does not. (1.22, 1.23, 1.24)
- Momentum — Why a slow lorry is harder to stop than a fast bicycle — and why every safety device ever designed does the same one thing. (1.2, 1.25, 1.26)
- Conservation of Momentum — The bookkeeping rule that survives every collision — and why a force is really a rate of change of momentum. (1.27, 1.28, 1.29)
- Moments and Centre of Gravity — Why a spanner works better when it is longer, where an object's weight can be said to act, and how two supports share a load. (1.30, 1.31, 1.32, 1.33)