2. The graph shows the x component of the net force on an object versus position. The work done by the net force on the object can be found from the area "under" the force vs position graph. Find the work done by the net force as the object moves from (assume no frictional forces): 0 to 2 m b. 2 to 4 m c. 4 to 10 m d. 10 to 12 m e. 0 to 12 m Force (N) 30 20 10 -10 -20 0 2 1. I 4 + 6 Position (m) 8 T 10 12

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Chapter7: Work, Energy, And Energy Resources
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2. The graph shows the x component of the net force on an object versus position. The work done by the net force on
the object can be found from the area "under" the force vs position graph. Find the work done by the net force as
the object moves from (assume no frictional forces):
0 to 2 m
b. 2 to 4 m
c. 4 to 10 m
d. 10 to 12 m
e.
0 to 12 m
Force (N)
E. How fast is it moving at 12 meters?
30
20
10
-10
-20
0
2
1.
I
4
+
6
Position (m)
8
T
10 12
f. The object in the graph has a mass of 6 kg and had a speed of 4 m/s at x = 0. How fast is it moving when it is at
4 meters?
Transcribed Image Text:2. The graph shows the x component of the net force on an object versus position. The work done by the net force on the object can be found from the area "under" the force vs position graph. Find the work done by the net force as the object moves from (assume no frictional forces): 0 to 2 m b. 2 to 4 m c. 4 to 10 m d. 10 to 12 m e. 0 to 12 m Force (N) E. How fast is it moving at 12 meters? 30 20 10 -10 -20 0 2 1. I 4 + 6 Position (m) 8 T 10 12 f. The object in the graph has a mass of 6 kg and had a speed of 4 m/s at x = 0. How fast is it moving when it is at 4 meters?
1. A 10 kg at a mail facility slides down a 10-meter sorting chute. The
height of the chute is 2 meters. The speed of the package at the top
of the chute is 5 m/s, and it is moving at 3 m/s when it reaches the
bottom. Let g = 10 m/s². Write the relations you use symbolically
before substituting in numbers.
a. What is the change in the kinetic energy of the package when it
slides down the chute? Be careful with the sign (+/-)!
2m
Normal Force:
M
e. What is the magnitude of the frictional force?
b. Determine whether the work done by gravity and the normal force on the package is positive, negative, or zero.
Hint: Draw each force vector and displacement vector with their tails together. Think about angle between the
force and displacement.
Gravity:
20 m
9.8 m
What is the work done by gravity as the package slides down the chute? Be careful with the sign (+/-)
d. How much mechanical energy became thermal energy during this process, i.e., what is AEtherm? Use the work-
energy relation with friction: AKE+AEtherm = Wext-
f. What is the coefficient of kinetic friction between the package and the chute?
Transcribed Image Text:1. A 10 kg at a mail facility slides down a 10-meter sorting chute. The height of the chute is 2 meters. The speed of the package at the top of the chute is 5 m/s, and it is moving at 3 m/s when it reaches the bottom. Let g = 10 m/s². Write the relations you use symbolically before substituting in numbers. a. What is the change in the kinetic energy of the package when it slides down the chute? Be careful with the sign (+/-)! 2m Normal Force: M e. What is the magnitude of the frictional force? b. Determine whether the work done by gravity and the normal force on the package is positive, negative, or zero. Hint: Draw each force vector and displacement vector with their tails together. Think about angle between the force and displacement. Gravity: 20 m 9.8 m What is the work done by gravity as the package slides down the chute? Be careful with the sign (+/-) d. How much mechanical energy became thermal energy during this process, i.e., what is AEtherm? Use the work- energy relation with friction: AKE+AEtherm = Wext- f. What is the coefficient of kinetic friction between the package and the chute?
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