Exam 1

Exam 1

Motion
1. Inertia
  1. Measure of an object's resistance to changes in motion
  2. Newton's First Law
    1. If the total force acting on an object is 0, then the object will maintain that velocity forever.
      1. Constant velocity= same speed and direction
  3. Newton's Second Law
    1. Forces come in pairs= action pairs
    2. Total force on an object is equal to the sum of all the forces acting on that object
      1. F = ma
        1 N= 1 kg * m/s2
      2. Ftotal= F1 + F2 +F3....
  4. Newton's Third Law
    1. When one object exerts a force on a second object, that second object exerts an equal and opposite force on the first object
2. Position
  1. Displacement
    1. Change in position during a particular time
  2. Slope of PvT graph gives the value of velocity
3. Velocity
  1. Slope of VvT gives acceleration value
  2. Speed with direction
4. Acceleration
  1. Rate at which the velocity changes
  2. Average velocity= Change in velocity / change in time
    1. Instantaneous Velocity= velocity / time... Slope of the tangent line to a PvT graph
Chapter 3
1. Newtons Laws of Motion
2. Quantities
  1. Displacement
  2. Velocity
  3. Acceleration
3. Free body diagrams
4. Newtons Second Law
  1. F = ma
    1. Newtons Second Law Using Apparent Weight
      1. ma = F = N + F grav
5. Mass:
  1. Fgrav = -mg
6. Types of Forces
  1. Gravity
    1. -9.8 m/s^2
  2. Weight
    1. mg
  3. Normal Force
  4. Friction
    1. Kinetic Friction
      1. Ffriction = ukN
    2. Static Friction
      1. I Ffriction I < usN
  5. Drag
    1. Air Drag Using Newtons Second Law
      1. ma = Sum of F = Fgrav + Fdrag
7. Chapter 4
  1. Statics, AKA: Moving anything on Earth
    1. Force = Mass x Acceleration, AKA: Newton's Second Law
      1. Translational Equilibrium
        ∑F = F1+F2+F3...Fn = 0
        Net force must be equal to zero when in equilibrium
        Forces may act in more than one direction
        Break up the force into both "x" and "y" components
        Remember, ∑Fx = 0 and ∑Fy = 0 because the net force is still zero
  2. Projectile Motion, AKA: Baseball
    1. Motion curves typically resemble parabolas
      1. Acceleration due to gravity = 9.8 m/s^2
      2. Velocities can be broken down into both "x" and "y" components
        Breaking down velocities help find displacements and time
        Three equations to be used once some of the unknowns have been found
        Vfx = Vix + ax • t
        Displacement = Vix • t + 1/2ax • t^2
        Vfx^2 = Vix^2 + 2ax • displacement
    2. The trajectory for most simple projectile motion follows two forms of symmetry
      1. Symmetric in time, or time spent reaching the maximum height is always equal to the time spent falling back down
      2. Symmetric in space, or following a parabola curve as it goes through space

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	Created by cspicer over 10 years ago