Distance and Displacement (11.1 328-331)

FRAME OF REFERENCE A frame of reference is a system of objects that are not moving with respect to one another. To describe motion accurately and completely, a frame of reference is necessary. Refer to butterfly and flowers example on page 328 in the book.

Relative Motion: movement in relation to frame of reference How fast you are moving is relative to which frame of reference you choose to measure your motion. Relative Motion: movement in relation to frame of reference Old book define: te object or point from which movement is determined…..

Are you moving too? In a car: Do you look at the trees, the ground or the seat in front of you? Each has a different frame of reference

DISTANCE Length of the path between two points The distance to school is 4 blocks + 3 blocks + 4 blocks = 11 blocks Measure in Meters (m) & Kilometers (km) 1 km = 1000 m 100 cm = 1 m

DISPLACEMENT The direction from the starting point and the length of a straight line from the starting to end point. It doesn’t matter what the path was…just the final result

Distance and displacement

Changing direction Vector has a magnitude AND direction Arrows are used to show direction of a vector ADD displacements using vector addition

Displacement along a straight line: Vector Addition See fig. on pg 330     Resultant vector - the vector sum of two or more vectors.

Displacement that isn’t along a straight path See figure on page 331