Card Set Information

2012-12-15 19:35:35

Show Answers:

  1. What is velocity?
    The displacement of an object in a unit of time.
  2. What is Kinematics?
    The branch of physics dealing with describing the motion of an object.
  3. What is Dynamics?
    The branch of physics that is concerned with the motion of bodies under the action of forces.
  4. Velocity-time Graph
    • y- axis is velocity (km/h)
    • x- axis is time (s)
    • slope is acceleration
  5. Position-time Graph
    • y- axis is position or displacment (m)
    • x- axis is time (s)
    • slope is velocity
  6. What is a vector quantity?
    has size, unit, and direction.
  7. What is a scalar quantity?
    have a size and unit.
  8. What is acceleration?
    rate at which the velocity increases of decreases
  9. What is displacement?
    Describes both the size and direction of a change in position. 
  10. How do you find the displacement of object from velocity- time graph?
    Find the area.
  11. What is the period?
    Time required for one complete cycle.
  12. What is the bob?
    Mass at the end of the string/rope/wire.
  13. What is the amplitude?
    Maximum sideways displacement of the bob from its rest position.
  14. What is the cycle?
    A complete forward and back motion of the pendulum.
  15. What is terminal velocity?
    Velocity where air resistance is great enough to prevent further acceleration. 
  16. What did Aristotle believe about how objects fall?
    Objects fall at constant speed.
  17. What did Galileo believe about how objects fall?
    Believed objects would accelerate as they fall.
  18. What is the force of gravity?
    Force that attracts a body toward the center of the earth.
  19. What is electric force?
    Force between charges. Atoms and Molecules.
  20. What is strong nuclear force?
    Force that holds protons together. Significant when particles are close together. 
  21. What is weak nuclear force?
    Causes elementary particles to break apart. Fermions and bosons. radioactive decay.
  22. What is mass?
    The amount of matter in an object. (kg)
  23. What is weight? 
    The force of gravity on an object. (N)
  24. What is static friction? 
    Force that keeps a stone from slipping down a roof. 
  25. What is sliding friction?
    Force against a sled going down a hill.
  26. What is rolling friction?
    Force resisting motion of a wheel.
  27. Newton's First Law
    Every body continues in it's state of rest, or of uniform motion in a straight line, unless its is affected by another force. 
  28. Newton's Second Law
    If an unbalanced force affects an object, the object will accelerate in the direction of the force. The acceleration varies directly with the unbalanced force. The acceleration varies inversely with the mass of the object.
  29. Newton's Third Law
    For every action force there exists a reation force that is equal in magnitude and opposite in direction.