Physics 2 Unit 1 Unit 2

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Physics 2 Unit 1 Unit 2
2013-05-11 14:11:07

Motion and Forces
Show Answers:

  1. How is speed calculated?
    Speed = distance➗time
  2. What is meant by velocity?
    Velocity is speed in a give direction
  3. How is acceleration calculated?
    a = ( v - u ) ➗t

    • a = acceleration
    • v = final velocity
    • u = initial velocity
    • t = time
  4. What does the area underneath a velocity-time graph represent?
    The distance traveled in a given time
  5. What are forces measured in?
  6. Name the different types of forces?
    • Gravity
    • Reaction (Upthrust)
    • During force (thrust)
    • Air resistance
    • Water resistance
  7. What is meant by resultant force?
    • This is a single force that had the same effect as all forces acting on an object
    • E.g. Relation - gravity = RF
  8. What if the resultant force of an object is not 0?
    • There will be an acceleration in the direction of the force.
    • E.g. During force (1000N) - Air resistance (600N) = Resultant force (400N)
  9. How is resultant force calculated?
    F = m x a
  10. What is meant by the stopping distance of a vehicle?
    This is the distance traveled during the drivers thinking distance + braking distance
  11. How is thinking distance increased?
    • Tiredness
    • Alcohol
    • Drugs
  12. How can braking distance be increased?
    • Poor roads
    • Bad weather
    • Poor conditions of the car
  13. What is meant by the terminal velocity?
    This is when the object moves at a steady speed
  14. How is weight calculated?
    Weight = Mass x Gravity
  15. What is meant by an elastic object?
    An elastic object is one that regains its original shape after force is removed
  16. What is meant by elastic potential energy?
    Energy stored in an elastic potential energy when work is done to change its shape
  17. What does hooks law state?
    The extension of an elastic object is directly proportional to the force applied, providing the limit of proportionality is not exceeded
  18. What is the limit of proportionality of an object?
    This is the limit in which the object can withstand force
  19. What's the equation for hooks law?
    F = k x e

    • F = Force applied
    • k = spring constant
    • e = extension