Physics 205 Ock Test 2 Form 2 Worksheet With Answers - Dr. Huerta, 2014 Page 2
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6Dr. Huerta Phy 205 oCK Test 2 FORM 2 ANSWER KEY March 3, 2014
[I] This problem has 15 multiple choice questions.
CORRECT ANSERS ARE MARKED WITH X
2
IN ALL PROBLEMS USE g = 10 m/s
[1] A 50 kg woman is exerting a force of 20 N upon a 10 kg shopping cart as
she pushes it toward the east. The force exerted upon the woman by the
cart is
[a] zero N [b] 4 N toward the east
[c] 4 N toward the west
[d] 20 N toward the east [X] 20 N toward the west
[2] The coefficient of static friction between the bed of a truck and a box resting
on it is µ
= 0.5. The truck is traveling at 30 m/s along a horizontal road.
s
Find the least distance in which the truck can stop if the box is not to slide
2
(neglect any tendency of the box to lean or to tip over). Use g = 10 m/s
.
[X] 90 m
[b] 900 m
[c] 3 m
[d] 300 m
[e] insufficient information.
[3] A mass m moving on a circular track of radius R has a speed v at the
bottom of the track as shown in the figure to the left below. The normal
force that the track exerts upon the block is
v
v
v
[a] N = mg [X] N = mg + m
[c] N = mg
m
[d] N = m
mg
R
R
R
R
5 kg
60 N
3 kg
2 kg
m
v
[4] The three rigid blocks shown to the right in the figure above slide over a
frictionless surface while accelerated by the 60 N force. Find the magnitude
of the force that the 3 kg block is exerting upon the 5 kg block.
[a] 60 N
[b] 30 N
[X] 42 N
[d] 18 N
[e] 12 N
[5] A car of mass m
= 1000 kg has a velocity v
= 30 ˆ ı m/s. A truck of
car
car
mass m
= 2000 kg has a velocity v
= 10 ˆ ı m/s. The velocity of
truck
truck
the center of mass of the car-truck system is
[a] v
= 10 ˆ ı m/s. [b] v
= 20 ˆ ı m/s. [c] v
= 30 ˆ ı m/s.
CM
CM
CM
50
[d] v
= 40 ˆ ı m/s. [X] v
=
ˆ ı m/s.
CM
CM
3
Physics 205D TEST 2 FORM 2
March 3, 2014
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