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Transcript

  • 1. MOTION
    • We now know that unbalanced forces can change motion
  • Recognizing MotionTextbook pg 17-18
    When is an object in motion?
    Are you or your book moving
    Compared to the floor?
    Compared to the sun?
    What is a reference point?
    What do we assume about a reference point?
    For the bus example, why do you think you are moving backward?
  • 2. Recognizing Motion ANSWERSTextbook pg 17-18
    When is an object in motion?
    When it’s distance from another object is changing
    Are you or your book moving?
    Compared to the floor? NO
    Compared to the sun? YES
    • What is a reference point?
    A place or object used for comparison
    • What do we assume about a reference point?
    It is stationary
  • 3. Recognizing Motion ANSWERSTextbook pg 17-18
    For the bus example, why do you think you are moving backward?
    Your reference point (the other bus) wasn’t stationary
    You 
    Reference 
    point
  • 4. What’s a Frame of Reference?
  • 5. BACKGROUND OR OBJECT USED FOR COMPARISON
  • 6. Now we are going to look at ways to describe and measure motion
    SPEED
  • 7. How do we describe SPEED?
    HOW FAST SOMETHING GOES
  • 8. How do we CALCULATE SPEED?
    How we describe the speed of a CAR:
    Miles per hour (MPH)
    OR
    Kilometers per hour (km/h)
    What does the miles or kilometers measure?
    They are units for distance
    What does the hour measure?
    It is a unit for time
    What does the “per” or “/” mean in math?
    division
  • 9. Measuring Motion
    SPEED =RATE that an object moves
    Distance (D)
    Rate (speed) =
    Time (T)
  • 10. DISTANCE
    Length between two places
    Distance = rate (speed) x time
    D= RT
    “Dirt”
  • 11. TIME
    =
    d
    T
    r (speed)
  • 12. STEPS IN PROBLEM SOLVING
    • STEP 1. Write the formula
    • 13. STEP 2. Substitute given
    numbers and units
    • STEP 3. Solve for the
    unknown.
  • 14. SAMPLE PROBLEM:
    At what speed did a plane fly if it traveled 1760 meters in 8 seconds?
  • 15. SOLUTION
    Step 1. Question asked “What speed” so use:
    Rate (Speed) = Distance/Time
  • 16. SOLUTION
    Step 2. substitute distance = 1760 meters
    substitute time = 8 seconds
    Speed = 1760 meters/ 8 seconds
  • 17. SOLUTION
    Step 3. Do the math to get your answer
    Speed = 220 meters/second (m/sec)
  • 18. SAMPLE PROBLEMS:
    1. A car travels 240 kilometers in 3 hours. What is the speed of the car during that time?
    ANSWER: S= d/t S= 240 km/3 hr
    80 KM/HR
  • 19. The speed of a cruise ship is 50 km/hr. How far will the ship travel in 14 hours?
    Answer: D = ST
    700 km