1. ConcepTest Section 13.2 Question 1 Decide if each of the following quantities is a vector or a scalar. (a) Velocity (b) Speed (c) Force (d) Area (e) Acceleration (f) Volume

2. ConcepTest Section 13.2 Answer 1 (a)Vector (b)Scalar (c)Vector (d)Scalar (e)Vector (f)Scalar ANSWER COMMENT: Follow-up Question. Can you think of any other quantities that are vectors?

3. ConcepTest Section 13.2 Question 2 A plane wants to fly due south. There is a strong wind from the west. In what direction should the pilot point the plane to stay on course? (a) South (b) East (c) West (d) Between south and east (e) Between south and west

4. ConcepTest Section 13.2 Answer 2 (e), between south and west. ANSWER COMMENT: Follow-up Question. What shape is the path of an object that is dropped from the plane?

5. ConcepTest Section 13.2 Question 3 A car drives around an elliptical track, always going as fast as it can (without flying off the track). Compare the speed and the velocity of the car at the given points in Figure 13.1.

6. ConcepTest Section 13.2 Answer 3 The speeds are the same at P and R, but the velocity vectors point in opposite directions, tangent to the race track. The same is true of Q and S. ANSWER COMMENT: Follow-up Question. What do the acceleration vectors look like at these points?