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Lecture 15

# PHYSICS 3A Lecture Notes - Lecture 15: FrictionPremium

3 pages85 viewsWinter 2019

Department
Physics
Course Code
PHYSICS 3A
Professor
RITZ, T.
Lecture
15

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02/08/2019
PHYSICS 15 - Lecture 15 - Using Newton’s Laws: Friction, Circular Motion, Drag
Forces
*Images from Giancoli, Physics for Scientists and Engineers
Forces of Friction
When an object is in motion on a surface, there will be resistance to the motion,
called the force of friction
 (not a constant),   
  (constant)
Friction in Newton’s Laws Problems
Friction is a force, so it simply is included in the  (we may use for simplicity)
in Newton’s Laws
The direction of the force of friction is against motion
The determination of magnitude of the force of friction needs the normal force,

Example:
Two blocks connected by a rope of negligible mass are being dragged by a
horizontal force F. Suppose that F = 100.0 N, , and
the coefficient of kinetic friction between each block and the surface is
0.200.
(a) Draw a free-body diagram for each block
(b) Determine the tension T and the magnitude of the acceleration of the
system
What equations are appropriate for M1?