Chapter 6. Weight and contact forces

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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.

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


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Weight and contact forces

 
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