Links to related material and teachers' resources Weightlessness vs weightlessness "Imperial units" - slugs and pounds Young's modulus, Hooke's law and material properties Hooke's law and the limits to linearity. How Young's modulus is related to intermolecular or interatomic forces and energies. Simple experiments on coefficients of friction Using a spring balance and an inclined plane to determine coefficients of friction, and whether they depend on normal force or area of contact. Wheels and rolling Between a rolling wheel and the ground there is no relative motion. We derive equations for the kinematics of rolling. Analysing Motion Using frame grabbing software and spreadsheet software to determine velocity and accleration of an object. Car Physics Acceleration examples: braking with constant force and decelerating with air resistance. Some other problems in car physics Background material on gravity Gravity in context. Newton’s law and the shell theorem, Cavendish’s experiment, planetary motion, satellites, ‘weightlessness’, potential energy, escape velocity, blackholes, the rotation of the earth. Why g is not parallel to Fg The earth's surface is not an inertial frame, because of the earth's rotation. Consequently, in that frame, Σ F ≠ ma.    The approximation that mg = Fg  is good but not exact. Frames of reference for Newton's and Maxwell's laws -- Einstein's relativity Revise vectors Download all animations in this chapter (or individually below each thumbnail) Weight and contact forces
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