Transcript ConcepTest

Decide if each of the following quantities
is a vector or a scalar.
(a)
(b)
(c)
(d)
(e)
(f)
Velocity
Speed
Force
Area
Acceleration
Volume
ConcepTest • Section 13.2• Question 1
ANSWER
(a) Vector
(b) Scalar
(c) Vector
(d) Scalar
(e) Vector
(f) Scalar
COMMENT:
Follow-up Question. Can you think of any other quantities
that are vectors?
ConcepTest • Section 13.2 • Answer 1
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)
(b)
(c)
(d)
(e)
South
East
West
Between south and east
Between south and west
ConcepTest • Section 13.2• Question 2
ANSWER
(e), between south and west.
COMMENT:
Follow-up Question. What shape is the path of an object that
is dropped from the plane?
ConcepTest • Section 13.2 • Answer 2
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.
ConcepTest • Section 13.2• Question 3
ANSWER
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.
COMMENT:
Follow-up Question. What do the acceleration vectors look
like at these points?
ConcepTest • Section 13.2 • Answer 3