PHET Step 12: Sketch this track and label where the 5 spots could be. a. He is at his maximum speed b. He is stopped c. He is going his average speed He is going slow e. He is going fast d.

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In the Soap Box Derby, kids build non-motorized cars with very low-friction wheels. They race by rolling down a hill. The track at Akron's Derby Downs begins with a 14-meter section tilted 15 degrees below the horizontal. A. Draw a useful pictorial representation for this problem. Clearly indicate the angle above, and a useful coordinate system. B. What is the acceleration of a car rolling down this hill (ignore friction)? C. If a car starts from rest at the top of the section so that will be its speed at the bottom of this section of the track?

Two cars start at the same time and travel in the same direction along a straight road. The figure below gives the velocity, v, of each car as a function of time, t. v (km/hr) Car A Car B t (hr) (a) Which car attains the larger maximum velocity, and how do you know? O A, because the area under its velocity curve is smaller. O A, because the peak of its velocity curve is higher. A, because its velocity curve hits zero first. O B, because the area under its velocity curve is larger. O B, because the peak of its velocity curve is lower. O B, because its velocity curve hits zero second. (b) Which car stops first, and how do you know? O A, because the area under its velocity curve is smaller. O A, because the peak of its velocity curve is higher. O A, because its velocity curve hits zero first. O B, because the area under its velocity curve is larger. B, because the peak of its velocity curve is lower. O B, because its velocity curve hits zero second. (c) Which car travels farther, and how…