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Physics Final Review.docx

13 Pages

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PHYS 1080
Mike Massa

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Physics Final Review MechanicsRelationship between objects motion kinematics and forces acting on it newtons laws Displacement velocityacceleration If a0 vv and xxvt oooDisplacement is displacement is positivepositive Velocity is positive and Velocity is increasingconstant Acceleration is positive Acceleration is zeroDisplacement is positive Displacement is positive Velocity is increasing Velocity is positive andAcceleration is positive constantAcceleration is zero Area under curve displacement 2Gravity influences motion with constant vertical acceleration g 98ms motion in the horizontal and vertical direction are independent of each other Pen swipe swipe overgives cos away gives sin put pen over vector r and then rotate it from there to component of interestRelative velocity Motion occurs at constant velocity but total motion is due to contribution from 2 factorsEx Someone trying to swim directly across a river with a current rd Usually contain 3 velocities identify 2 and add to determine 3 resultantWind speed or water speed not likely resultant velocityOne velocity in normal conditionsCombine to give resultant or net motion ForceInteraction between 2 bodies an object and an agentSomething that causes an accelerationA vector magnitude and directionWithout a force there is no acceleration 1 Can be produced with or without contactTypes gravitational normal force tension friction magneticelectric Newtons laws of motionAn object in a state of uniform motion will remain doing so unless acted on by a nonzero resultant forceIf a resultant force acting on an object leads to an acceleration in the direction of the force the acceleration is proportional to the force and inversely proportional to the objects massFor every force there is an equal but opposite reaction forceobject at rest remains at rest and object in motion remains in motion unlessexternal force is applied Static equilibrium net force is zero and object isnt moving v0 Dynamic equilibrium net force is zero and object moves with constant velocityEquilibriumFree body diagrams diagram that represents all forces acting on objectDont draw forces acting on other objects caused by this object internal forces forces for ma term Static friction objects that are NOT movingf will match applied force s f doesnt have a predefined value s force of static friction can have value up to some maximum just as object starts to move static friction will take whatever value is needed to ensure that the object obeys Newtons Laws Kinetic friction unbalanced forcesfN kk when drawing FBD line up x or y axis with direction of acceleration Torque forces caused by rotationmeasure of ability of a force to cause rotation ofan objectdepends on how hard we push F how far we are from pivot R2
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