A 18kg crate is pushed across the floor, using a force that makes an angle of 21 degrees with the horizontal. The coefficient of static friction between crate and floor is µs=0.45. The coefficient of kinetic friction between crate and floor is µk=0.20. a) What magnitude of pushing force is required to just start the crate sliding?

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: