What this topic covers
Qualitative treatment of types of motion: Random, rectilinear, translational, rotational, circular, orbital, spin, oscillatory, with illustrations. Numerical problems on co-linear relative motion. Force as the cause of motion, including contact forces (push and pull) and non-contact (field) forces (electric, magnetic, gravitational pull). Solid friction: static and dynamic, coefficients of limiting friction and their determinations, advantages and disadvantages, methods of reducing friction (ball bearings, rollers, streamlining, lubrication). Viscosity (friction in fluids): Definition and effects, simple explanation as extension of fluid friction, application in lubrication qualitatively treated, terminal velocity and its determination. Simple ideas of circular motion: Experiments demonstrating vertical/horizontal circular motion, difference between angular speed and velocity. Diagram to illustrate centripetal force. Qualitative discussion of banking of roads in reducing sideways friction.
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