practice 04 – ALIBHAI, ZAHID
1
Latest unpenalized work: Feb 12 2007 Mon
day 04:00 (after this date you can not make a
perfect score). Work cuto±: Feb 11 2007, 4:00
am.
Question 1
part 1 of 2
10 points
Three objects can only move along a
straight, level path. The graphs below show
the position
d
of each of the objects plotted
as a function of time
t
.
d
t
I
d
t
II
d
t
III
The magnitude of the velocity
b
vV
b
of the
object increases in which of the cases?
1.
I and II only
2.
I only
3.
III only
4.
I, II, and III
5.
II only
6.
II and III only
7.
I and III only
Question 2
part 2 of 2
10 points
The sum of the forces
s
F
i
= 0 on the
object is zero in which of the cases?
1.
II and III only
2.
I and III only
3.
II only
4.
I only
5.
III only
6.
I and II only
7.
I, II, and III
Question 3
part 1 of 1
10 points
A block of mass
m
accelerates with acceler
ation
g
up a frictionless plane that is inclined
at an angle
α
above the horizontal. The force
F
o
that pushes the block is at an angle
β
above
the horizontal. Find the force
F
o
.
m
α
β
F
o
1.
mg
1 + sin
β
cos(
β
−
α
)
2.
mg
1
cos(
α
+
β
)
3.
mg
1 + sin
α
cos(
β
−
α
)
4.
mg
1
−
sin
β
cos(
α
+
β
)
5.
mg
1
−
sin
β
cos(
β
−
α
)
6.
mg
1 + sin
α
cos(
α
+
β
)
7.
mg
1 + sin
α
cos(
α
−
β
)
8.
mg
sin
β
cos(
α
+
β
)
9.
mg
1 + sin
β
cos(
α
−
β
)
10.
mg
1 + sin
β
cos(
α
+
β
)
Question 4
part 1 of 3
10 points
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View Full Documentpractice 04 – ALIBHAI, ZAHID
2
The following 3 questions refer to the colli
sions between a car and a truck whose weight
is much heavier than the car (
M
≫
m
). For
each description of a collision below, choose
the one answer from the possibilities that best
describes the size (or magnitude) of the forces
between the car and the truck.
m
M
v
v
They are both moving at the same speed
when they collide.
1.
The truck exerts the same amount of force
on the car as the car exerts on the truck.
2.
Neither exerts a force on the other; the
car gets smashed simply because it is in the
way of the truck.
3.
The car exerts a greater amount of force
on the truck than the truck exerts on the
car.
4.
The truck exerts a greater amount of force
on the car than the car exerts on the truck.
5.
Not enough information is given to pick
one of the answers above.
6.
None of the answers above describes the
situation correctly.
Question 5
part 2 of 3
10 points
The car is moving much faster than the
heavier truck when they collide.
1.
Not enough information is given to pick
one of the answers above.
2.
The truck exerts a greater amount of force
on the car than the car exerts on the truck.
3.
None of the answers above describes the
situation correctly.
4.
The truck exerts the same amount of force
on the car as the car exerts on the truck.
5.
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 Spring '08
 Turner
 Force, Friction, Work, ZAHID Latest

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