Physics 4A
FIRST EXAM Chapters 1  4
Spring 2004
1
Name:_________________________________________
Solve the following problems in the space provided.
Use the back of the page if needed.
Each
problem is worth 20 points.
You must show your work in a logical fashion starting with the
correctly applied physical principles shown on the last page.
Your score will be maximized if your
work is easy to follow because partial credit will be awarded.
1.
The velocity of an object as a function of
time is shown in the graph at the right.
Answer the following questions about the
object’s motion.
Be sure to explain your
reasoning for full credit.
(a)When is the velocity a maximum?
Reading the graph, the velocity peaks at
t = 2.0s.
(b)What is the maximum velocity?
Reading the graph, the peak velocity is
v = 15m/s
.
(c)When is the velocity zero?
Reading the graph, the velocity is zero at
t = 0s and at t = 5.0s.
(d)When is the acceleration zero?
According to the definition of acceleration, the acceleration is the slope of the graph so, the
acceleration is zero at
t = 2.0s and from about t = 8.0s to 10s
.
(e) When is the acceleration a maximum?
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 Fall '09
 Kagan
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