Motion in One DimensionSection 1 Preview Section 1 Displacement and VelocityDisplacement and Velocity Section 2 AccelerationAcceleration Section 3 Falling.

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Presentation transcript:

Motion in One DimensionSection 1 Preview Section 1 Displacement and VelocityDisplacement and Velocity Section 2 AccelerationAcceleration Section 3 Falling ObjectsFalling Objects

Motion in One DimensionSection 1 What do you think? Is the book on your instructor’s desk in motion? –Explain your answer.

Motion in One DimensionSection 1 Frame of Reference Motion –a change in position Frame of reference –A point against which position is measured Example: A train traveling between stations –It is in motion when measured against the track. –It is stationary when measured against a seat.

Motion in One DimensionSection 1 Click below to watch the Visual Concept. Visual Concept Frame of Reference

Motion in One DimensionSection 1 Displacement (  x)  Straight line distance from the initial position to the final position (change in position) Can be positive or negative

Motion in One DimensionSection 1 Displacement What is the displacement for the objects shown? Answer: 9 cm Answer: -15 cm

Motion in One DimensionSection 1 Displacement - Sign Conventions Right (or east) ---> + Left (or west) ---> – Up (or north) ----> + Down (or south) ---> –

Motion in One DimensionSection 1 Classroom Practice Problems A car travels 36 km to the north in 30.0 min. Find the average velocity in km/min and in km/h. –Answer: 1.2 km/min to the north or 72 km/h to the north A car travels km to the east. If the first half of the distance is driven at 50.0 km/h and the second half at a km/h, what is the average velocity? –Answer: 66.7 km/h to the east