Motion Ch. 11 Intro to Physics.

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Presentation transcript:

Motion Ch. 11 Intro to Physics

Distance and Displacement Frame of reference Relative Motion Distance Straight Line? Units? Displacement Vector Ex.

Speed and Velocity Speed Units? Instantaneous Average Ex. The speedometer in every car also has an odometer that records distance traveled A. If the odometer reads zero at the beginning of a trip and 35 km a half hour later what is the average speed? B. Would it be possible to attain this average speed and never exceed a reading of 70 km/h on the speedometer? If a cheetah can maintain a constant speed of 25 m/s, it will cover 25 meters every second. At this rate how far will it travel in 10 seconds? In 1 minute?

Distance – Time Graphs

Velocity Speed and direction Headwind, tailwind Vector Constant velocity? Changing? Headwind, tailwind Suppose that the river was moving with a velocity of 3 m/s, North and the motorboat was moving with a velocity of 4 m/s, East. What would be the resultant velocity of the motorboat (i.e., the velocity relative to an observer on the shore)?

Acceleration Rate of velocity change Ex + - Direction? Suppose a car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to45 km/h, then from 45 to 50 km/h. What is its acceleration? In 5 seconds a car moving in a straight line increases its speed from 50 km/h to 65 km/h, while a truck goes from rest to 15 km/h in a straight line. Which undergoes greater acceleration? What is the acceleration of each vehicle?

Speed-time graphs