A block of mass $$4kg$$ is pressed against a wall by two perpendicular horizontal forces as shown in the figure. $$F1$$ is perpendicular to the wall and $$F2$$ is parallel to the wall. μ$$s=0.8$$ , μ$$k=0.5$$ and $$g=10$$ $$m/s2For$$ $$F1=75$$ N and $$F2=30$$ N, the block remains at rest on the wall then the force of friction is

Question

A block of mass $$4kg$$  is pressed against a wall by two perpendicular horizontal forces as shown in the figure. $$F1$$ is perpendicular to the wall and $$F2$$  is parallel to the wall. μ$$s=0.8$$ , μ$$k=0.5$$ and  $$g=10$$ $$m/s2For$$ $$F1=75$$ N and  $$F2=30$$ N, the block remains at rest on the wall then the force of friction is

Infinity Learn · Accepted Answer

Given mass of block  $$m=4$$ kgμ$$s=0.8$$ ; μ$$k=0.5$$ and $$g=10$$ $$m/s2$$  Limiting value of static friction is  $$fL=$$μ$$SN=0.8$$×$$75=$$ $$60$$ N, whereas resultant of forces on the plane of the wall i.e. weight $$=40$$ N and $$F2=30$$ N is $$50$$ N . Hence friction will adjust its value at  $$50$$ N.

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A block of mass 4kg is pressed against a wall by two perpendicular horizontal forces as shown in the figure. F1 is perpendicular to the wall and F2 is parallel to the wall. μs=0.8 , μk=0.5 and g=10 m/s2For F1=75 N and F2=30 N, the block remains at rest on the wall then the force of friction is

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