Net Forces, Friction, Coefficients of Friction. Newton’s 3rd Law. Sliding Book Example. Why do things not continue to move at constant velocity? If the sliding book slows down, what’s the force responsible? How could I keep it moving at a constant velocity?
Newton’s 3rd Law
A net force of zero
No, Inertia keeps the object moving!
For every action , there is an equal and opposite reaction.
Force on Newton by Einstein = Force on Einstein by Newton
Newton tries to outsmart Einstein
by loading his own cart with lead bricks)
How does the corrugated surface change Friction?
Corrugations in the surfaces grind when things slide.
Lubricants fill in the gaps and let things slide more easily.
Friction vector is opposite in direction of motion
Lubrication, change surface,
reduce normal force
Fcurve = macurve = mv2/r