In the example above, the average vertical velocity would be 2 cm in 5 frames or 2/5 cm/frame. Yes, it’s ok to have weird units for velocity. It is still distance per time.

Scientists draw graphs of data to help analyse a situation. A velocity-time graph of a journey can give information about acceleration (the gradient) and distance travelled (displacement).

The velocity time graphs give all three variables for motion–velocity which can be read off at any time. Area is displacement and gradient is acceleration. Next page.

The last time I looked at this projectile motion lab, I was confused. My different methods for measuring the launch speed of the ball were not even close to being consistent. So, I am bringing out ...