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# Motion and forces 1.1

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Initial section of our motion and forces unit. This presentation is used to deliver notes to the class.

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### Motion and forces 1.1

1. 1. motion<br />An object in motion changes position.<br />
2. 2. Jamal is in a car travelling north. He looks out of his window and thinks that the cars around him are moving slowly. Ellen is in a car going south. She thinks that the northbound traffic is moving quickly. Explain why Jamal and Ellen have different ideas about the motion of the traffic.<br />Maybe these terms will help: position, motion, reference point, speed, frame of reference <br />MOTION<br />
3. 3. MOTION<br />Where is the ___________?<br />NO POINTING!!!<br />The position of a place or an object is the location of that place or object<br />We describe the position of something by comparing it to where we are. <br />
4. 4. MOTION<br />Where is Rochester?<br />We usually describe the location of a city compared to that of another city. <br />A location to which you compare other locations is a reference point. <br />Longitude and latitude is based on reference points. <br />
5. 5. What is distance?<br />(n) The extent or the amount of space between two things. <br />We measure distance depending on the information that we want. <br />Straight line distance (flight) vs. total length of a certain path (hike)<br />SI unit = meters (m) = 3.3 feet<br />MOTION<br />
6. 6. What is motion?<br />(n) The change of position over time.<br />Do we need to see something move to know that motion has occurred?<br />No. We can assume based upon starting and ending positions. <br />MOTION<br />
7. 7. What is speed?<br />(n) A measure of how quickly or slowly an object changes position.<br />A faster object moves farther than a slower object over the same amount of time. <br />MOTION<br />
8. 8. If you sit still in a chair, are you moving?<br />It depends on the position and motion of the person watching you. <br />If inside the room, no, you are not moving.<br />If in space, yes, you are moving. <br />This is known as frame of reference.<br />MOTION<br />
9. 9. Frame of reference aka relative motion<br />Consider this: <br /> You are sitting directly behind a bus driver. <br /> - Is the driver moving?<br /> - Is the street sign moving?<br />An observer is on the sidewalk.<br /> - Is the driver moving?<br /> - Is the street sign moving?<br />MOTION<br />
10. 10. REVIEW QUESTIONS<br />What do you need to describe an object’s location?<br />Describe how your position changes as you jump over an object.<br />Give an example of how the apparent motion of an object depends on the observer’s motion.<br />MOTION<br />