Well, I just finished eating breakfast on the lanai and decided this picture would be a pretty good example of what we just learned in class. It's kind of small, but there's a car (which i'll call carA) trying to get onto the freeway in the top right corner. We learned in class that acceleration is the rate of change in velocity and/or direction. This change is going to be important for carA because while it doesn't have to change the general direction that it is going in, it does have to go at a faster velocity in order to reach the velocity of the other cars on the freeway. (if it maintained its velocity, it would be slower than the other cars and would probably wait forever before it could change lanes) If left is the negative direction and right is the positive direction, then carA would have negative acceleration because it's increasing its velocity in the negative direction. It would also have negative velocity because it's moving in the negative direction.