Engineering Mechanics - Friction - Discussion
Discussion Forum : Friction - General Questions (Q.No. 1)
1.
The boy at D has a mass of 50 kg, a center of mass at G, and stands on a plank at the position shown. The plank is pin-supported at A and rests on a post at B. Neglecting the weight of the plank and post, determine the magnitude of force P his friend (?) at E must exert in order to pull out the post. Take 
B = 0.3 and C = 0.8.
Discussion:
19 comments Page 2 of 2.
Aswathvignesh said:
1 decade ago
How to solve this problem?
Hasan said:
1 decade ago
I want the details of solution?
Lira said:
1 decade ago
I still don't understand how do you get into the answer?
Alfredo said:
1 decade ago
I need more explanation to your solution thank you and regard.
Nasma noor n v said:
1 decade ago
I am getting two different answers if we take first fbd of plank and then post. If we take moment about the base for post am getting 264N. If I take sum of forces in x and why direction am getting 284. 1.
Rohan said:
1 decade ago
Draw fbd of the diagram then calculate summation of x and why separately also take moment at point a.
Vignesh said:
1 decade ago
Here should we take planck and post as two bodies and draw the free body diagrams for each of them? please explain the procedure!
Swapnil dafal said:
1 decade ago
Draw the free body digram (FBD).
Then take sammetion of fx & sammetion of fy equal to zero and find moment with respect to point a. Also apply work energy principle for bettting third equation.
Then take sammetion of fx & sammetion of fy equal to zero and find moment with respect to point a. Also apply work energy principle for bettting third equation.
Mani said:
1 decade ago
Ya how to solve the problem?
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