One question says "It has been said that centripetal force is is not a unique force. Outline what a centripetal force is as well as three (explained) examples of what is meant by this statement.(5 marks)" Here is my theory: Newtons first law states that an object in motion stays in motion unless an unbalanced net force acts upon this object, casuing it to change direction. Centripetal force is that force. Examples of CP include friction, tension, and gravity. I was also thinking normal force?? Anyway, that is all ive come up with so far...i dont know how exactly to explain those examples but does anyone have any suggestions as to what it means by saying "is not a unique force?" And here is a word problem that i cant crack: A skier skiing downhill reaches the bottom of a hollow with a velocity of 23.4 m/s and then coasts up a hill with a 31.5 degree slope. How far up the hill will she travel before she stops if the coefficient of friction is 0.14? (10 marks) Ok, so far all i have done is drawn a FBD, and found out the X and Y components of the skier. Dont know if that is right, but i ended up with a weird equation: Fnet = Ff = Fg sin(theta) and Fn = Fg cos(theta) therefore Ff = u(Fgcostheta) *the small case letters in front of the F's are subscripts for friction, gravity, and normal force, and the u is coefficient of friction Thanks for the help.