Velocity is measure of how much displacement changes with time. Acceleration is a measure of how much the velocity changes with time. Both velocity and acceleration are vector close vectorA ...

The iPhone makes it easy to do all kinds of cool physics. Like, say, use the change in velocity in an elevator to measure the height of a building.

A horizontal line on a distance-time graph close distance-time graphA graph with distance travelled plotted on the vertical axis against time taken on the horizontal axis. shows that the object is ...