1.Which of the following statements is NOT correct? Friction is an example of a
ID: 1336753 • Letter: 1
Question
1.Which of the following statements is NOT correct?
Friction is an example of a conservative force.
The work done by a conservative force on an object is independent on the path taken.
The work done by friction on an object depends on the path taken.
The work done by a conservative force on an object along path AB is negative that of path BA.
E. The force due to gravity is an example of a conservative force.
A 10-kg box is at the top of a 5-m plane inclined at 37º with the horizontal. The box starts from rest and slides down the plane. The coefficient of kinetic friction is 0.20. The magnitude of the change in the potential energy of the box is
A.Friction is an example of a conservative force.
B.The work done by a conservative force on an object is independent on the path taken.
C.The work done by friction on an object depends on the path taken.
D.The work done by a conservative force on an object along path AB is negative that of path BA.
2.E. The force due to gravity is an example of a conservative force.
A 10-kg box is at the top of a 5-m plane inclined at 37º with the horizontal. The box starts from rest and slides down the plane. The coefficient of kinetic friction is 0.20. The magnitude of the change in the potential energy of the box is
Explanation / Answer
A) False
B)True
C) True
D)True
so your answer is A
2)
E) true
change in potential energy = work done by friction = mg*h
h= 5*sin 37
so change in potential energy = 10*9.8 * 5*sin 37 = 294.88 J
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