EES 0836 Lecture 19: Lecture 19
3 Apr 2016
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Lecture -19: units, laws of motion, units of measurement, physics forms a link between the physical world (concepts) and the mathematical world (quantitative, this inevitably involves measurements. Measurements inevitably involve units: we"ll stick to mks (si) units in this course. 1 meter is close to 40 inches: mass in kilograms (kg) Intimately related to the idea of inertia. Effectively how many protons and neutrons in the thing. Force: something that pushes or pulls: then we have newton"s second law of motion, great: now we have to talk about acceleration. But first let"s give some examples of force : examples of force, examples: Gravity exerts a downward force on you. The floor exerts an upward force on a ball during its bounce. A car seat exerts a forward force on your body when you accelerate forward from a stop. The seat you"re sitting in now is exerting an upward force on you (can you feel it?)
