Acceleration Velocity (speed) measures a rate of change in position (distance/time). Acceleration measures a rate of change in velocity (Velocity/time)….V2-V1/time.

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Presentation transcript:

Acceleration Velocity (speed) measures a rate of change in position (distance/time). Acceleration measures a rate of change in velocity (Velocity/time)….V2-V1/time.

#1 A car taking a turn at a constant speed is accelerating---TRUE. *Change in velocity due to direction. If an object has low acceleration, it isn’t moving very fast---FALSE. *Cruise control in a straight line is one example. An accelerating car is always gaining speed---False. *Could just be changing direction for example!

Didn’t do #2. #3-Moving around a center. #5-Two components of a vector are magnitude and direction. #6-Units for acceleration---you should have underlined: meters per second per second OR in other words, meters per second squared (m/s2)

#7---velocity is unchanged from B-C! B---8m/s, t= 1s C ---8m/s, t= 2s Velocity 2 (8m/s) – Velocity 1 (8m/s) 1 second 0/1 = 0 m/s2 Velocity is unchanged.

#8— A-B Velocity 2 (8m/s) – Velocity 1 (4m/s) ÷ 1 sec. 8-4/1 4 m/s2 Whole trip– (7 m/s-4 m/s) ÷ 3 s 3/3 = 1 m/s2

#9—Increase in velocity (underline) Positive Acceleration. Decrease in velocity (underline) Negative Acceleration.

Centripetal Acceleration #10—What direction is the acceleration in centripetal acceleration, where speed does not change and direction does? --Perpendicular to the direction of motion. In order for an object to execute circular motion - even at a constant speed - the object must be accelerating towards the center of rotation. How does centripetal acceleration feel in real life? It feels like a force pushing you into the car door when turning. It’s what keeps you in your seat on the rollercoaster, or plastered against the wall in a gravitron. The centripetal force (created by centripetal acceleration….circular movement creates this) is the force that causes an object to move in a circle, acting towards the center of the circle. In the case of a satellite the centripetal force is gravity, in the case of an object at the end of a rope, the centripetal force is the tension of the rope.