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# Entire Physics 7C Lecture/Textbook Notes.doc

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Department
Physics
Course
PHYSICS 7C
Professor
David William Casper
Semester
Spring

Description
Physics 7C 1 Linear Motion Equations velocity = (change in position)/(change in time) acceleration = (change in velocity)/(change in time) final velocity = initial velocity + (acceleration)(time) final position = initial position + (initial velocity)(time) + (1/2)(acceleration)(time)^2 (final velocity)^2 = (initial velocity)^2 + 2(acceleration)(change in position) dot product w = (x, y) l = (a, b) w*l = x*a + y*b Physics 7C 2 Chap 4 • dynamics • o relationship of motion to the forces that cause it • Newton's laws of motion • o First o  if there is no force acting on an object, the object will maintain constant velocity  inertia - tendency of a body to keep moving o Second o  if a particle is not going at a constant speed, there is acceleration  Fnet = ma   net Force = (mass)(acceleration) o Third o  for every action, there is an equal and opposite reaction  F of A on B = -F of B on A  review page 121 figure 4.26 • Force - interaction between 2 bodies • o external force o  push, pull o normal force (N) o  happens when 2 objects are in contact  perpendicular and pointing up/away of the object  3rd law o friction (f) o  happens when 2 objects are in contact  parallel and opposite of the force o tension (T) o  pulling force exerted by a cord o Springs o weight (w) o  w = mg Physics 7C 3  weight N = (mass Kg)(9.8 m/s)  N = Kgm/s^2 • superpoosition of forces • o 2 forces acting on an object result in a single force • components • o the x, y, z ect. of a vector mastering physics • • o 45.7 N • • o T = 11.6 N o F = 29 N Physics 7C 4 • • o 25 N • • o A = 5.62 o B = 4.43 Physics 7C 5 Chap 5 if pull = friction force, the object does not move • if a body is at equilibrium, Fnet = 0 (no acceleration, but still can be moving if there is no friction) • Kinetic Friction • o o  kinetic friction force = (coefficient of kinetic friction)(normal force) • Static Friction • o o  static friction force is less then or = to (coefficient of static friction) (normal force) • circular motion • o o  centripetal acceleration = (velocity)^2/(radius)  where T = period, the time for 1 revolution Physics 7C 6 Physics 7C 7 Physics 7C 8 Chaps 6.1, 6.2, 7.1, 7.2 • types of energy (all measured in Joule = Nm = Kg m^2/s^2) • o potential o  energy related to position  for gravity (gravitational)    for springs (elastic)     k is a spring constant and x is the distance compressed o kinetic o  energy of motion  • o work o  transfer of energy from an external force  W = ∫Fd = FdcosΘ   Work = (integral of Force)(displacement) = (Force) (displacement)(angle between the 2)   only if constant force in direction of straight-line displacement  work is - if it is working opposite of displacement, otherwise it is positive • conservation of energy • o Physics 7C 9 o o Physics 7C 10 Chap 8 • linear momentum • o o  momentum = (mass)(velocity)  momentum = kg * m/s o x, y, and z components • impulse • o product of the average net force and time interval o o  Impulse = final momentum - initial momentum  N*s  valid even when net force varies with time • principle of conservation of momentum • o o if there is no external forces o x, y, z components • collisions (may be treated as isolated systems because external forces are so slight) • o follows principle of conservation of momentum o  P1 + p2 = 0 o elastic o     difference of initial velocity of 2 particles = opposite difference of final velocities of 2 particles  bouncier o inelastic o  final KE < initial KE  KE goes into, say, bending a fender  completely inelastic Physics 7C 11   objects stick together  (same final velocity) • Center of Mass • o position • o  o  system's x position center of mass = sum of all
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