A block of mass 50kg rests on a rough horizontal plane whose coefficient of static friction is 0.3. What is the least force required to just move it if it is pulled (i) horizontally and (ii) at 45^(@) to the horizontal.

A block of mass 50kg rests on a rough horizontal plane whose coefficie

1.	A block of mass 50kg rests on a rough horizontal plane whose coefficient of static friction is 0.3. What is the least force required to just move it if it is pulled (i) horizontally and (ii) at 45^(@) to the horizontal.
Answer» SOLUTION :`(i) f_(s)=mu_(s)mg=0.3xx50xx9.8=147N`, `(II)f_(s)=mu_(s)mgcostheta=147cos45=103.96N`