Can someone please answer this question in terms of the forces acting?
Something like that. The problem lies in the wording: "raise yourself up". Raise yourself up relative to what? We have to assume you mean relative to the earth. That being the case, why should a pull you exert directly on your hair be expected to change your altitude with respect to the earth? To change your altitude with respect to the earth you really have to exert a force against the earth, somehow. By stepping up onto a staircase that's sitting on the earth, for example.So that is because of the applier of the force and the object to which the force is applied are the same?
When you pull on your own hair, any upwards force on your hair will be opposed by a downwards force at your shoulder. This involves two sets of Newton third law pairs of forces: 1 - your hand exerts an upwards force on your hair, and your hair exerts a downwards force on your hand; 2 - your arm exerts a downwards force on your shoulder, and your shoulder exerts an upwards force on your arm.Why someone cannot raise him/herself up by holding the hair? Can someone please answer this question in terms of the forces acting?
Damn, you're right.Newton's First Law of Motion puts it very well.