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Physics Honors
Chapter 5 Test
FORM
1
DO NOT WRITE ON THIS TEST.
SHOW WORK ON ANSWER SHEET
REPORT ALL ANSWERS TO 3 SIGNIFICANT FIGURES.
USE SCIENTIFIC NOTATION WHEN APPROPRIATE {X>100 or X< 0.1}
2
1
2
K
mv
=
g
U
mgh
=
cos
W
Fd
θ
=
2
1
2
e
U
kx
=
e
F
kx
= 
Given:
2
0
ax
bx c
+
+ =
W
K
U
Q
∆
=
+
+
W
P t
=
P
Fv
=
f
N
F
F
μ
=
[
]
2
9.81
g
m s down
=
then:
2
4
2
b
b
ac
x
a
 ±

=
UNLESS OTHERWISE INSTRUCTED:
ASSUME FRICTIONLESS, HORIZONTAL MOTION
ASSUME ALL SPRINGS ARE INITIALLY AT THEIR RELAXED LENGTH
A 0.01kg object is initially sliding at 9.0 m/s.
It goes up a ramp (increasing its elevation by 1.5 m), and then
moves horizontally before striking a spring of force constant
k
= 100 N/m.
The spring is compressed by 5.0
cm as it completely stops the object.
1)
How much heat energy was created during this motion?
A 5kg block is dropped from rest from a point 5.0 m above the top of a spring of
force constant
k
= 800 N/m, as shown at right.
2)
At what rate is gravity doing work on the block at the instant it strikes the spring?
3)
What is the maximum compression of the spring?
4)
For the instant at which the speed of the block is largest,
describe in words
(a)
the net force acting on the mass; (b) the potential energy of the spring; (c) the
potential energy of the system; (d) and the total energy of the system.
A child's toy wagon (mass
m
= 10 kg) is pulled from rest by a constant force
F
= 50 N,
which acts in a direction 50˚ from the vertical.
The wagon moves horizontally across
a frictionless surface.
5)
What is the speed of the wagon when it has moved a horizontal distance of 5.0 m?
A nonzero net force acts on an object.
6)
Under what conditions will this force do NO work on the object?
Give
two
examples, and explain your
answers.
A spring has a force constant
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 Spring '09
 Ramesh
 Physics, Work

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