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Ithaca College - PHYS 101 HW9-SOL.pdf
Ithaca_College_-_PHYS_101_HW9-SOL.pdf
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Ithaca College - PHYS 101 HW9-SOL.pdf-I. Two glide...
Ithaca_College_-_PHYS_101_HW9-SOL.pdf-I. Two gliders, A and B,
Ithaca College - PHYS 101 HW9-SOL.p...
Ithaca_College_-_PHYS_101_HW9-SOL.pdf-I. Two gliders, A and B,
Page 7
The wall does no work.
The point of application of the force does not move.
3.
Consider system ABS, which consists of block A, block B, and the spring.
Write an expression for the net external work done on system ABS by external
forces in terms of given quantities (
i.e.,
F
A
,
d
A
,
t
1
, and/or
t
2
).
Explain.
The net external work on the system is just that due to the hand.
W= F
A
d
A
.
B.
Block B is now removed, so that the right end of the spring is
now directly in contact with the wall, as shown.
During the
interval from
t
3
to
t
4
, block A is again pushed a distance
d
A
by
a hand exerting a constant force
F
A
.
The wall exerts a force
on the spring that varies with time but is always directed to
the left.
Let system AS consist of block A and the spring.
Consider the interval from
t
3
to
t
4
:
1.
Is the net external work done on system AS by external
forces over this interval
greater than, less than,
or
equal
to
that on system ABS over the interval from
t
1
to
t
2
?
Explain.
The net external work is the same.
The wall does no work on the system since the
point of application of the force does not move.
The only work done is that done by
the hand.
2.
Write an expression for the work done on block A by the hand over this interval in terms
of the given quantities (
i.e.,
F
A
,
d
A
,
t
3
, and/or
t
4
).
Explain.
W= F
A
d
A
.
3.
What is the displacement of the left end of the spring during this interval?
d
A
What is the displacement of the right end of the spring during this interval?
Zero
A
A
t
=
t
3
d
A
t
=
t
4
d
A
The hand exerts
a constant force
of magnitude
F
A
Written homework
9
Physics 101 - Andrew Crouse - Ithaca College
Fall
Adapted from:
Tutorials in Introductory Physics,
McDermott, Shaffer, & P.E.G., U. Wash.
https://www.coursehero.com/file/9170223/HW9-SOL/
This study resource was
shared via CourseHero.com
Page 8
Which of these displacements should be used to calculate the work done on the
spring by the wall?
Explain.
Zero.
The point of application of the force by the wall does not move.
Is the work done on the spring by the wall
positive, negative,
or
zero?
Zero
4.
Write an expression for the net external work done on system ABS over this interval by
external forces in terms of the given quantities (
i.e.,
F
A
,
d
A
,
t
3
, and/or
t
4
).
Explain.
W= F
A
d
A
.
C.
Is your answer for question B4 consistent with your answers for questions B1 and A3?
If so,
explain how.
If not, resolve the inconsistency.
Yes, the work is the same for both systems.
Written homework
9
Physics 101 - Andrew Crouse - Ithaca College
Fall
Adapted from:
Tutorials in Introductory Physics,
McDermott, Shaffer, & P.E.G., U. Wash.
https://www.coursehero.com/file/9170223/HW9-SOL/
This study resource was
shared via CourseHero.com
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Santa Clara University
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