Physics 140 – Fall 2007
midterm #1 review
Bad
logic 
1.
What equation do I use?
Good
logic 
1.
What information do I know?
2.
What information am I being asked to find?
3.
What key ideas/conceptual tools should I apply?
4.
What equations express these ideas?
Suppose this lab is performed inside a car of a TGV moving at a
constant speed of 220 km/hr along a curved track. What will be the
outcome of the experiment?
A physics lab to determine
the acceleration of gravity
involves measuring the time
of flight of a small ball
falling straight down a
narrow vertical cylinder.
1)
The ball will hit the side of the cylinder; the experiment
won’t work.
2)
The ball will drop straight down with acceleration 9.8 m/s
2
.
3)
The
ball will drop straight down with acceleration different
from 9.8 m/s
2
.
4)
None of the above.
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A train wheel of radius
R
with a black dot painted on its edge
(point P) is rolling without slipping on a rail. Between times
t
1
and
t
2
the wheel turns through half a revolution. Over this time
interval, the displacement vector of point P, expressed in unit
vector notation, is
1.
2
R
i
+
2
R
j
2.
2
!
R
i + 2
R
j
3.
2
R
i
+
!
R
j
4.
!
R
i + 2
R
j
5.
!
R
i +
R
j
j
i
The three vectors labeled
a, b
and
c
have magnitudes of 3, 4 and 10,
respectively.
Which of the
following operations produces a
result with the largest magnitude?
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 Fall '07
 Evrard
 Physics, Force, Friction, constant speed, shortest possible time, large car, key ideas/conceptual tools

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