PHYSICS 1L03 Lecture 4: Set4-Ave.pdf
5 Feb 2015
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Drawing all external force acting on an object: a three way tug-on-war: Identify the system: for the system, draw a close curve around the system, name and label each contact force, name and label long range force. Identify all forces acting on the object: for the free body diagram, draw a coordinate system, represent the object as a dot at the origin of the coordinate, draw vectors for the identified forces. 1: a car is being towed up a 20o slope at constant velocity. Draw free body diagram: a skier is pulls up a snow-covered hill by a tow rope at a constant speed. Draw free body diagram: a file cabinet in the back of a dump truck. Forth series: forces, equilibrium: a block of mass m rests on an inclined plane that makes an angle of with the horizontal, as shown in fig 3. 55.
