the speed of the object at point A? Explain how you can tell As nef oD&dane; is
ID: 1572839 • Letter: T
Question
the speed of the object at point A? Explain how you can tell As nef oD&dane; is 2ero Prom work enorgu noorem, ninatic c. An object travels from d eoby al frces point A to point B while two constant forces,F, and F., of unequal magnitude are exerted on it as shown. I. Is the total work done on the object by F, positive, negative, or zero? Point B 2. Is the total work done on the object by F, positive, negative, or zero? Is the net work done on the object positive, negative, or zero? Explain. Point A . Is the speed of the object at point B greater than, less than, or equal to the speed of the object at point A? Explain how you can tell. 4. -33-Explanation / Answer
C
1.
the object travels from A to B , while the force F3 acts in opposite direction from B to A. hence the angle between the force and displacement is 180
we know that , W = F d Cos180 and Cos180 = - 1
hence W< 0
work done by F3 is negative
2.
the object travels from A to B , while the force F4 acts in same direction from A to B. hence the angle between the force and displacement is 0
we know that , W = F d Cos0 and Cos0 = - 1
hence W> 0
work done by F3 is positive
3.
since F3 > F4
hence work done by F3 > work done by F4
hence the net work done is negative
4.
Since F3 > F4
the net force on the object acts in opposite direction of the motion of the object. hence the object slows done due to negative work being done on the object. so the speed at B will be smaller than speed at A
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