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Physics 125 – Winter 2006
Practice Midterm Exam No. 1
The actual exam will be closedbook and will last 90 minutes.
You will be allowed to use a calculator and a 3
×
5"crib sheet.
The exam contains 20 multiple choice questions.
On the scantron sheet, you will need to fill in your
name
and
section number
. In the space marked “Identification Number”
you will need to write your
8digit UM ID
(not your SSN).
Each exam will have a different
version number
which will
need to be written in the area of the
scantron
marked “Form.”
Page 1
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A rock is suspended from a string and moves downward at constant speed.
Which
statement is true concerning the tension in the string if air resistance is ignored?
A) The tension is zero newtons.
B) The tension points downward.
C) The tension is equal to the weight of the rock.
D) The tension is less than the weight of the rock.
E) The tension is greater than the weight of the rock.
2.
A book is resting on the surface of a table.
Consider the following four forces that arise
in this situation:
(
1
)
the force of the earth pulling on the book
(
2
)
the force of the table pushing on the book
(
3
)
the force of the book pushing on the table
(
4
)
the force of the book pulling on the earth
The book has an acceleration of 0 m/s
2
.
Which pair of forces, excluding "actionreaction" pairs,
must be equal in magnitude and opposite in direction?
A)
1
and
2
B)
1
and
3
C)
1
and
4
D)
2
and
3
E)
2
and
4
Page 2
A car is initially traveling at 50.0 km/h.
The brakes are applied and the car stops over a
distance of 35 m.
What was magnitude of the car's acceleration while it was braking?
A) 2.8 m/s
2
B) 5.4 m/s
2
C) 36 m/s
2
D) 71 m/s
2
E) 9.8 m/s
2
4.
A 1000kg car travels along a straight 500m portion of highway (from
A
to
B
) at a
constant speed of 10 m/s.
At
B
, the car encounters an unbanked curve of radius 50 m.
The car follows the road from
B
to
C
traveling at a constant speed of 10 m/s while the
direction of the car changes from east to south.
What is the magnitude of the acceleration of the car as it travels from B to C?
A) 2 m/s
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This note was uploaded on 07/11/2011 for the course PHYSICS 125 taught by Professor Unknown during the Spring '08 term at University of Michigan.
 Spring '08
 unknown
 Physics, mechanics

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