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# Motion and force

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### Motion and force

1. 1. Motion and Force<br />8SCIENCE Wed. May 4/Thurs. May 5<br />
2. 2. What is motion?<br />All objects start in a position or place and this changes as the object moves<br />We can sense how fast objects are moving<br />insects crawling on a window, people crossing the street<br />To describe how fast objects are moving, we talk about speed<br />Speed is the rate of change in a position, usually in meters/second (m/s)<br />
3. 3. Speed<br />Speed can be described at a moment in time or you can describe average speed<br />Example: If you travel 80m (meters) in 40s (seconds) what is your speed?<br />Average speed can be determined by dividing the total distance travelled by the time it takes<br /> Average speed (s) = total distance (d)<br /> total time (t)<br />Example: if someone ran 100 meters in 20 seconds, then ran another 100 meters in 25 seconds, what would be the average speed for the 200 meters?<br />
4. 4. Speed<br />At rest – not moving<br />Speed changes at a constant rate<br />
5. 5. Speed and direction<br />The direction of the motion can also be important<br />Displacement is the change in position of an object and includes direction<br />Need the start and end points to calculate<br />Ex: What is this person’s displacement if they begin at A <br />and travel to point C?<br />- 5 meters<br />
6. 6. Velocity<br />When speed is combined with a direction, we have velocity<br />Example speed: I was driving at 30km/h.<br />Example velocity: I drove 30km/h north of the school.<br />Velocity is the rate of change of displacement<br />Velocity (v) = displacement (d) <br /> time (t)<br />Ex: If you run around a 6 km circular track in 60 minutes (1 hour) What is your average speed (in km/h)? <br />What is your velocity?<br />