Newman Semester 2

Nota:

• Mrs. Newman Webpage:  https://drive.google.com/open?id=0B6uqOOeFiIDvfk1NbWphRk1pbV91VXZ1NUMweWlPMElXNHZTLU5tSHdTVmctOFFhdlU2OTQ&authuser=0

1. Centripetal Force
   1. Fcentripetal = m* v2/r
      1. Any force can be centripetal
         1. force that causes an object to move in a circle
            1. will change directions to always point inward to the center
               1. inertia is what allows it as it makes the object stay in the motion you put it in
               2. centripetal force and velocity are perpendicular on a diagram
                  1. If you stop spinning the object in a circle (or string snaps) the object will follow the velocity
            2. directly proportional to mass
               1. inversely proportional to raidus
                  1. directly proportional to the square of the object's linear speed
2. Rotation & Revolution
   1. Rotation
      1. Spinning on an internal axis
         1. Example: a basketball spinning on a finger
   2. Revolution
      1. An object spinning on an external axis
         1. Example: A merry-go-round
      2. Distance traveled = circumference
         1. radius = person distance from center of axis
         2. C = 2(pi)r
3. Linear and Angular Speed
   1. Linear Speed
      1. Distance traveled per unit of time
         1. Those farthest from the center will have the fastest linear speed
      2. v = 2(pi)r / t (time for one revolution (seconds) )
   2. Angular Speed
      1. Amount an object in circular motion spins per unit of time
         1. Angular Speed = Rotations or Degrees / time
            1. 1 rotation = 360 degrees
      2. People in different positions will still have same angular speed
4. Centrifugal force
   1. not a true force
      1. apparent outward force
         1. effect of inertia when object is being forced into a circle
5. Gravitational Force
   1. Fgravity = G(m1*m2)/r2
      1. G = 6.67e-11
      2. Force of gravity between Earth and the sun keeps Earth in its orbit
         1. exists between all objects that have mass
            1. Strength of force depends on the mass of the objects and the distance between them
               1. weight = force of gravity between you and Earth
                  1. depends on your mass, your planets mass, and distance from center of planet
                     1. force of gravity b/w two objects lies along the line connecting their centers
                        1. direction of the force changes to stay pointed along the line b/w their centers
                        2. mass and gravity are directly proportional to each other
                        3. distance and gravity are inversely squared
                           1. decrease of graviational force is related to the square of the distance
                              1. double the distance = force divided by four
                        4. measured from center of both objects

Nota:

• Unit Folder: https://drive.google.com/a/student.dist113.org/folderview?id=0B6uqOOeFiIDvfm41dE9CbFEzODExeVZTaVhBZ1lQX1R3VzZib0VLTGJ5TFpXUFR5UzU1RUU&usp=drive_web

1. Work (Done Against Gravity
   1. W= mass*gravity*height
      1. work done by or against Fgravity
         1. force times the distance moved in the direction of the force
            1. total work done against gravity same no matter the path
               1. W = F*d
                  1. Fg = m*g
            2. measured in Joules or Newtons (depends on problem)
2. Power
   1. rate at which work is done
      1. measured in Watts
         1. 1 watt = 1 joule per second
            1. Sometimes horsepower is used
               1. One hP = 746 Watts
                  1. P = work/time
3. Energy
   1. Potential Energy
      1. Energy due to its position
         1. gravitational potential energy
            1. energy of an elevated object
            2. Ep = m (mass kg)* g (acceleration due to gravity, 9.8/10 m/sec2) * h (height meters)
   2. Kinetic Energy
      1. Energy of motion
         1. Ek = 1/2 *v * v2
            1. direct relationship with mass
               1. directly squared of velocity
   3. Ep top = Ek bottom
   4. Never created or destroyed; but converted into other forms