PHYS 2101 Lecture : Lecture4
Document Summary
> today chapter 6 force and motion 2. If the net force on an object vanishes, that object will not accelerate: if the net force on an object does not vanish, that object will accelerate. Net force acceleration: two objects interacting exert equal & opposite forces on each other. For =30 , what is the tension t: draw a free-body diagram. T: draw coordinates & resolve forces, de ne direction of acceleration. The vertical components of t must equal w. Friction: types of friction: static & kinetic. When surfaces slide past each other: static friction: surfaces are stuck together . Apply a force, but block does not move . Static friction between block & table opposes motion: forces balance to give no acceleration f = fs, static friction: opposes motion of surfaces past each other up to a limit. Normal force how much surfaces press together. Kinetic friction: when the block starts to move: friction still resists motion.
