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  • What is the minimum pushing force (in N) just to move the block? <

What is the minimum pushing force (in N) just to move the block?

Option: 1

50


Option: 2

40


Option: 3

55


Option: 4

60


Answers (1)

best_answer

As we learn 

Minimum Pushing Force P and Angle(alpha) From Horizontal -

  

F=Pcos\alpha

R=W+Psin \alpha

P cos \alpha=\mu(W+P sin\alpha)

P=\frac{W sin \theta}{cos(\alpha + \theta)}

\mu= Coefficient of friction

w = weight

P = Pulling force

- wherein

Use 

F=\mu R

F = Force

R = Reaction

 

 

for just tendency to move P\cos 53^{\circ}=f_{l}=P\cos 53^{\circ} =\mu R

P*\frac{3}{5}= 0.60(5*10-P*\frac{4}{5})

P= 0.6*5*10 *\frac{3}{5} = 50N

 

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