Unformatted text preview: s perpendicular to
each other. The velocity vector is horizontal at that point
and the acceleration vector is downward. Quick Quiz 4.10
A particle moves along a path and its speed increases with
time. In which of the following cases are its acceleration and
velocity vectors perpendicular everywhere along the path?
(a) the path is circular
(b) the path is straight
(c) the path is a parabola
(d) never Quick Quiz 4.10
Answer: (d). The velocity vector is tangent to the path. If the
acceleration vector is to be perpendicular to the velocity
vector, it must have no component tangent to the path. On
the other hand, if the speed is changing, there must be a
component of the acceleration tangent to the path. Thus, the
velocity and acceleration vectors are never perpendicular in
this situation. They can only be perpendicular if there is no
change in the speed. QUICK QUIZ 4.1
(end of section 4.1)
A bird’s eye view of a blue car traveling on a circular track is
shown below. The car speeds up so that its speed at point...
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 Winter '14
 Acceleration, Velocity

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