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Midterm II (Physics 3A)
Name_________________, ID___________________, Discussion_______________
Multiple choices (8% each)
1. A heavy packing case is pulled by a force
F
exerted at a 30° angle, and pushed by a
force
P
exerted horizontally. If the surface is frictionless, the equation of motion of the
packing case is
30°
F
P
a.
Ma
F
P
=
+
.
b.
Ma
F
P
=
°+
sin 30
.
c.
Ma
F
P
=
°+
cos 30
.
d.
Ma
F
P
Mg
=
°+
−
°
sin
cos
30
30
.
e.
Ma
F
P
Mg
=
°+
−
°
cos
cos
30
30
.
2. The horizontal surface on which the objects slide is frictionless. If
M
=
2 0
.
kg
, the
tension in string 1 is 12 N. Determine
F
in N.
1
2
M
F
M
2
M
2
a. 25
b. 20
c. 30
d. 35
e. 40
3. A 1200 kg car on a flat surface moves in a circle with a 62 m radius. What is the
minimum coefficient of friction needed for the car to continue in the circular path at a
speed of 15 m/s without slipping?
a. 0.15
b. 0.23
c. 0.35
d. 0.37
e. 0.41
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View Full Document4. A 0.60 kg mass is swung in a vertical circle. It is fastened to a string 0.35 m long.
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This note was uploaded on 12/12/2011 for the course PHYS 3A taught by Professor Casper during the Fall '07 term at UC Irvine.
 Fall '07
 Casper
 Physics, Force, Friction

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