A student in a physics class made a picture of this.

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A stoplight 20 m to the west turns yellow. Your car is traveling west at 12 m/s. You hit the brakes and decelerate at a rate of 6.0 m/s 2. Your car stops.

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Presentation transcript:

A student in a physics class made a picture of this. 1. East is considered positive. A stoplight 20 m to the west turns yellow. Your car is traveling west at 12 m/s. You hit the brakes and slow down at a rate of 6.0 m/s2. Your car stops before it reaches the stoplight (which is considered to be at the origin). A student in a physics class made a picture of this. x to = 0 s xo = + 20 m vo = – 12 m/s a = – 6.0 m/s2 Which of the following is labeled wrong? a. xo b. vo c. a d. a & vo e. all of the values are correct

Which graph best matches the motion diagram? 2. The motion of a car is represented with the motion diagram below. x vinitial vfinal a Which graph best matches the motion diagram? v t b v t c v t a. v t d e. No graph represents the motion correctly

Below is a mathematical description of the same motion. 3. A bicycle is moving on the road. Its motion is described by the graph below. v t Below is a mathematical description of the same motion. What should the signs of vo and a be to be consistent with the above graphical description? vo a a. + – b. + + c. – + d. – –

4. A hot air balloon is stationary in the sky as seen in the picture. A person throws a ball up in the air at 5 m/s. Which set of equations best matches this process? a. Vf = (5.0 m/s) + (10 m/s2) t b. Vf = ( - 5.0 m/s) + (10 m/s2) t c. Vf = (5.0 m/s) + ( - 10 m/s2) t d. Vf = ( - 5.0 m/s) + ( - 10 m/s2) t e. Either b or c are correct

Which description best represents this situation? 5. Susy sees the mathematical representation below in her physics book. Which description best represents this situation? a. This is a car that is moving to the right and is accelerating in the same direction. b. A ball was thrown upwards in the air from a height of 5 m at a speed of 20 m/s. c. A ball was thrown downwards from a height of 5 m at a speed of 20 m/s.

6. Alan sees the following three diagrams next to each other in his physics book. v t a t A B C Are these three diagrams consistent with each other? Yes, all three diagrams are consistent. No, Diagram A is not consistent with the other two. No, Diagram B is not consistent with the other two. No, Diagram C is not consistent with the other two. None of the diagrams are consistent.