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Describing motion along a straight line precisely enough to predict it.

1. 2.1Abstract Free Fall

How the forces on an object decide whether its velocity changes, and by how much.

1. 4.1Identifying Forces
2. 4.2Free-Body Diagrams
3. 4.3The Process of the Second Law
4. 4.4Weight and Apparent Weight
5. 4.5Thrust Sideways, Gravity Down
6. 4.6A Force at an Angle

How to find the current through and the voltage across every part of a circuit.

1. 15.1Multi-Battery Circuits
2. 15.2Solving Circuits with Matrices