ok so we curl our four fingers of the right hand and the thumb up denotes positive and thumb down denotes negative. but how exactly do we know which side the thumb as the reference while maintaining the curl direction? you get what I mean sir? it's hard to explain but I hope you get my drift and can help clarify on this.
i mean like you know, we can view an axis from different eye orientation or vantage point. so how do we know if the thumb is considered upward or downward?
For moments, your fingertips can point in the direction of the force as you wrap around the axis of rotation - your thumb points in the direction of the moment along that axis.
@@vfgrfbgrb Are you clear on the concept of a moment having a direction that is perpendicular to the plane formed by the line of a force and and the position vector from the rotation point to the force? You may find this helpful: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-N9rfMxdp0zI.html Or, consider you are sitting in a car and about to make a left turn - with two hands on the wheel, your right hand is going to apply a force up, the left hand a force down. This creates a counter clockwise moment about the steering column - if you take your right hand and wrap it around the steering column, your fingers wrap around in the direction of the motion caused by the moment, and your thumb (sticking out) points back at you in the direction of the moment - perpendicular to the steering wheel. Another example (not mine) that shows the moment and the right hand rule ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3cIj09PzjaA.html at 4:30
