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Ch. 18 Motion and Momentum

Section 1 p. 525-527. Ch. 18 Motion and Momentum. What is motion?. A change in position Motion occurs when something changes position relative to a point of reference. Point of Reference. The point that is used to determine if an object changes position

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Ch. 18 Motion and Momentum

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  1. Section 1 p. 525-527 Ch. 18 Motion and Momentum

  2. What is motion? • A change in position • Motion occurs when something changes position relative to a point of reference.

  3. Point of Reference • The point that is used to determine if an object changes position • Example-If the starting line is your point of reference in a 100m race, then your position has changed by 100m relative the starting line and motion has occurred

  4. Distance • Distance is the length of the route you travel.

  5. Displacement • The distance between the starting point and the ending point and the direction you travel.

  6. Speed • Speed is the distance an object traveled in a unit of time. • Speed (meters /second)= distance (in meters) time (in seconds)

  7. Average Speed • Divide the total distance traveled by the total time.

  8. Instantaneous Speed • The speed of an object at one instant in time.

  9. Constant Speed • A speed that stays the same the entire distanced traveled.

  10. Graphing Motion • Use a distance-time graph • Time is always plotted on the x-axis • Distance is always plotted on the y-axis • The steeper the line the greater the speed • A horizontal line means there is not change in position, which means the speed is zero.

  11. Velocity • The velocity of an object is the speed of the object and the direction of its motion. • Velocity can change • if the object’s speed increases or decreases • Direction of motion changes • Or they both change

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