Laws Of Motion Question 149

Question: A block of mass 1 kg is at rest on a horizontal table. The coefficient of static friction between the block and the table is 0.5. The magnitude of the force acting upwards at an angle of 60 from the horizontal that will just start the block moving is

Options:

A) 5N

B) 202+3N

C) 2023N

D) 10N

Show Answer

Answer:

Correct Answer: B

Solution:

[b] R+Fsin60=mg

R=mg3F2 If block just starts moving Fcos60=f=μR Or F+3F2=10 or F=202+3



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