homework help!!!! Hi! everyone I am new tp physics and I need help. We had just finished a part on Newtons 1st and 2nd laws and were given a question as follows. An object is sliding down a hill, at an angle 30 degrees to the horizontal. The object has mass 50Kg. If the acceleration of the object is 0.6 ms^-2, what is the friction force acting on the object. So, I first began by constructing the free body force dig. I marked the weight Mg downwards, the normal reaction R upwards, frictional force backwards and a force P forward. So firstly did I mark it correctly? Now I know that F=ma does apply here but I am not sure about the other component. All I could come up with is Psin30+mg = R and F= Pcos30. I know something is wrong here but I don't know what!. Can anyone help me please?