Motion Which way did it go?

What is Motion? Motion occurs when an object changes position over time.

Speed Speed is the rate at which an object moves. Speed depends on distance and time. Speed is measured in meters per second m/s, km/hr, mi/hr.

Calculating Average Speed Average speed is calculated by dividing total distance by total time taken. Avg. speed = total distance/total time

Examples You traveled 20 miles on your bike. It took you a total of 4 hours. What was your average speed? You walked 6 miles to your friends house and it took you 2 hours to get there. What was your average speed?

Velocity Velocity is the speed of an object in a particular direction. Speed and velocity do not mean the same thing because velocity includes a direction. Velocity changes as speed or direction changes.

Examples 60 mph – Speed 60mph North – Velocity 70mph – Speed 70 mph Southeast - Velocity

Acceleration Acceleration is the rate at which speed changes. Acceleration is calculated by the following formula: Acceleration = final speed – initial speed / time Acceleration is measured in meters per second squared ((m/s) 2 )

Examples While drag racing out of our school parking lot, I time myself at a speed of 40 meters per second seven seconds after starting. What was my acceleration during this time? While running away from the school building on a Friday afternoon, my speed increases from 5.0 m/s to 7.5 m/s over a period of 1.25s. What is the my average acceleration during this period?

Examples of Acceleration Acceleration in which speed increases is called positive acceleration. Acceleration in which speed decreases is called negative acceleration..