Question

A,package,crate,is,placed,on,a,20,deg,inclined,plane.If,the,coefficient,of,static,friction,between,the,crate,and,the,plane,is,0.65,Will,the,crate,slide,down,the,plane?,justify,your,answer!

Answer 1

The crate will slide down the plane IF
M g sin 20 > M g cos 20*0.65
sin 20 > 0.65 cos 20
tan 20 > 0.65

Check your trig functions and see if this is true.

Answer 2

since tan20 is 0.36 which is less than 0.65, therefore the crate will not slide.