Chapter5 newton’s lawsSlide 2Slide 3To push or to pull a sled?Slide 5Slide 6Slide 7Slide 8A box against a wallThe skier with frictionSlide 11Velocity dependent forcesTwo boxes and a pulleySlide 14A plane, a pulley and two boxesSlide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23NifrFFChapter5:Applications of Newton’s lawsChapter5 newton’s lawsOne-dimensional equilibriumA gymnast has just begun climbing us a rope hanging from a gymnasium ceiling. She stops, suspended from the lower end of the rope by her hands. Her weight is 500 N, and the weight of the rope is 100 N. Analyze the forces on the gymnast and on the rope. Equilibrium of a particleTwo-dimensional equilibrium: A cherry-pickerA car engine with weight w hangs from a chain that is linked at point O to two other chains, one fastened to the ceiling and the other to the wall. Find the tension in each of the three chains, assuming that w is given and the weights of the chains themselves are negligible.To push or to pull a sled?Friction is less when you pull, since FN is lessA box against a wallWhen mg>Ffr=sFN, the box slides downThe skier with frictionK=0.01Winning (acceleration) does not depend on mass!Skier with frictionVelocity dependent forcesTerminal velocity }= 0dtdvmFR bvmgFmgFD0 bvmgbmgv Two boxes and a pulleyA plane, a pulley and two boxesInclined plane with two boxes(a) For the monkey to move up, T>mg. the bananas also move up.(b) The bananas and monkey move with the same acceleration and the distance between them remains constant.(c) Both the monkey and bananas are in free fall. They have the same initial velocity and as they fall the distance between them doesn’t change.(d) The bananas will slow down at the same rate as the monkey. If the monkey comes to a stop, so will the bananas.What happens to the monkey and the bananas as the monkey climbs up, or releases the rope and falls, and grabs the rope to stop the fall.Work and EnergyW(A)=60 N, w=12 NFriction coefficient =0.25Work and EnergyN and fk applied to B by tabletopElastic forces) xForces in
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