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Distance and Displacement. Chapter 11.1. Motion . An object is in motion when its distance from another object is changing. If no chance than no motion is perceived . Frame of Reference. Frame of reference is a place or object that you assume is fixed
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Distance and Displacement Chapter 11.1
Motion • An object is in motion when its distance from another object is changing. • If no chance than no motion is perceived
Frame of Reference • Frame of reference is a place or object that you assume is fixed • observations of how objects move in relation to that frame of reference. • perception of motion depends on the observers frame of reference. • Humans usually use the earth as their frame of reference.
Measuring Distance • Distance: The length of a path between 2 points. • Distance is measured according to the amount of distance involved • EX: • Marble rolls= mm or cm (millimeters or centimeters) • Car travels= m or Km ( meters or kilometers)
Displacement • Displacement: the direction from the starting point and the length of a strait line from the starting point to the ending point. • Displacement is what we use to give people directions to our house. • Ex: walk north 5 blocks from the school take a right a distance with a direction associated with it
Displacement Vs distance displacement distance
Combining Displacements • An example of this is a vector. • This is a quantity that has a magnitude and a direction • Magnitude= size length or amount • Arrows on a graph are used to represent vectors. • The length of an arrow shows the magnitude of a vector
Examples Combining displacements • Vector addition is the combining of vector magnitudes and directions • EX: 5km 10km 5 + 10= 15km 10km 3km 10 – 3= 7 km