Chapter 1 Force and motion

Bell Work 1/4/10 Welcome Back! I hope you all enjoyed your break. What is something that you will change this quarter to help improve your grades? What grade would you like to get in science this quarter? What are at least 3 things that you will do to reach your science goals?

1/4/10 - How do you describe the location of an object? Choose an object in the classroom that is easy to see Without pointing to, describing, or naming the object, write down directions for your partner to find the object. Trade papers with your partner and see if they can find your object. If your partner cannot find the object do not tell them what it is instead rewrite the directions and have your partner try again.

Answer these questions on the back of your piece of paper. Was your partner able to find your object on the first try? What difficulties did you have in writing down the directions? What difficulties did you have in trying to follow your partner’s directions? What kind of information must you give another person when you are trying to describe a location?

Force and Motion 1.1 Notes

position the location of a place or object Each time you identify the position of an object, you are comparing the location of the object with the location of another object or place. Why do you need to use two locations to describe the position of an object?

Describing a position What are two ways that you could describe the location of a city? Reference point – a location to which you compare other locations Longitude and latitude system – locations are given by two numbers longitude (how many degrees east or west it is from the prime meridian) and latitude (how many degrees north or south it is from the equator)

Measuring distance What unit do scientists use to measure distance? A meter There are two ways to measure distance Straight line distance Total length of a path taken between two positions

How do you know that motion has occurred? There is a distance between starting and ending positions of an object. Motion – the change of position over time Below, while jumping, the athlete’s horizontal and vertical positions change.

Describing motion The speed of a moving object is a measure of how quickly or slowly the object changes a position. Compare the motion of a fast moving object to a slow moving object in a given amount of time. The way in which an object moves can change. Discuss the movement of a raft in the water.

Relative Motion How an observer sees your motion depends on how it compares with his own motion. Frame of reference – motion is described by the location of the observer See page 13 relative motion on a school bus

Bell Work 1/5/10 What information do you need to describe an object’s location? Describe how your position changes as you jump over an object. Kyle walks 3 blocks south from his home to school, and Jana walks 2 blocks north from her home to Kyle’s home. How far and in what direction is the school from Jana’s home?