If bob walks 2 blocks east, 4 blocks south, and 2 blocks west, what distance has he traveled? what is his displacement?

Distance covered = 8 blocks.

Displacement = 4 block south.

Explanation:

We ,know displacement is given by distance between final and initial position and distance is total distance covered by a body.

Let , displacement in NORTH direction will be taken positive and SOUTH direction be taken as negative.

Similarly , displacement in EAST direction will be taken positive and WEST direction be taken as negative.

While calculating displacement we need to use these sign but in distance calculation scalar sum is only needed.

Distance covered = .

Displacement = ( 2 block east) + (4 blocks south) + (2 blocks west)

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.