Question

1. coordinate system identify a coordinate system you could use to describe the motion of a girl swimming across a rectangular pool.
2. displacement the motion diagram for a car traveling on an interstate highway is shown below. the starting and ending points are indicated.

start..... end
make a copy of the diagram. draw a vector to represent the cars displacement from the starting time to the end of the third time interval.

1. position two students added a vector for a moving objects position at t = 2 s to a motion diagram. when they compared their diagrams, they found that their vectors did not point in the same direction. explain.
2. displacement the motion diagram for a boy walking to school is shown below.

home........ school

Explanation:

1. A rectangular pool is two-dimensional; a Cartesian (x-y) system with origin at a corner can describe horizontal and vertical positions.
2. Displacement vector is from start to end of the third interval; assuming dots mark interval ends, third interval ends at the 4th dot (Start, 1st, 2nd, 3rd interval ends).
3. Position vectors depend on the origin; different origins cause direction differences even for the same position.

Answer:

1. A Cartesian (x-y) coordinate system with the origin at one corner of the pool.
2. Draw a vector from the "Start" point to the 4th dot (end of the third time interval).
3. The students likely chose different coordinate origins, resulting in position vectors pointing in different directions.