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Motion Chapter 10 Section 1 Measuring Motion PAGES 316-324 25

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Objectives Explain the relationship between motion and a frame of reference. Relate speed to distance and time Distinguish between speed and velocity Solve problems related to time, distance, displacement, speed and velocity 25

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Observing Motion Motion is described in relation to another object that stays in place– a stationary object The stationary object is a reference point sometime is called a reference frame or frame of reference 26

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Distance Distance measures the path taken A B 27

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Displacement-the change in position of an object A straight line between the start and finish Difference is straightness and direction Toward B A B 27

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Distance vs Displacement

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Project Design a demonstration that illustrates the difference between distance and displacement You may use a toy car, airplane, rat, use your imagination Be ready to present next class!

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Speed Speed describes how fast something moves Speed the distance traveled divided by the time interval S = d/t for example 5m/s Meters / second the slash is read per 28

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Time Distance Graph Slope of the line is the object’s speed 28 Dependent variable independent variable

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Constant speed The speed does not change Most objects do not move with constant speed 29

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Instantaneous Speed The speed at a given point in time NASCAR 173.45 MPH The car’s speed at that instant A car’s speedometer 29

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Speed Speed-- how fast something is going Speed is a scalar quantity. Scalar tells the amount of something 30

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Formula— Time is measured in Seconds or hours Distance is measured in cm, km, or m 50 km—d 2 hrs—t How fast—speed 50km/2hr=25km/hr s=d/t 30

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Velocity Velocity is speed and direction Velocity is a vector quantity. A vector shows speed and direction. Vectors are arrows that show direction.

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Velocity Velocity is speed and direction Velocity is a vector quantity. A vector shows speed and direction. Vectors are arrows that show direction.

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Does your velocity change? Yes... Because the direction changed and velocity includes both speed and direction

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Draw an arrow over the number indicating speed 50m/s

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Velocity Vectors Velocity uses the same units but can include a vector arrow that indicates direction

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Velocity Vectors 80 120 100 With the wind Same--Add Against the wind opposite--subtract 100 20

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Worksheet Velocity Note the longer the line the faster you are going The shorter the slower

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Using vectors

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Parallelogram rule: when given two vectors draw parallel lines. The diagonal of the parallelogram is the resultant

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Velocity Speed and direction Velocity is a vector quantity. Escaped lion You need to know his speed and direction!!!! 31

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Velocity Vectors A vector shows the direction and magnitude (speed) of an object 31

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Draw an arrow over the number indicating direction and approximate speed 50m/s 31 Velocity uses the same units as speed but can include a vector arrow that indicates direction

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Using vectors Parallelogram rule: when given two vectors draw parallel lines. The diagonal of the parallelogram is the resultant 32

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Velocity Vectors 80 120 100 With the wind Same--Add Against the wind opposite--subtract 100 20 33

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Freefall -- an object falling free of all restraint 34

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V=at Velocity = acceleration times the time a– acceleration t – time Acceleration due to gravity is 9.8m/s 2 34

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How fast? v=at 0s1s2s3s4s5s6s7s8s 34

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Distance of Fall 012345678 D=1/2at 2 35

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Freefall speedometer—shows how fast odometer—shows how far Two equations v=at and d=1/2at 2 35

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Freefall assignment d= how far?d=1/2at 2 0s1s 2s3s 4s 5s v= how fast v=at Write in the seconds at the bottom

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