Vectors for Mechanics Form

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welcome to m1 today's video we're looking at vectors in mechanics uh chapter three so a vector just very briefly is essentially something that has size and direction okay and we tend to assume in this mechanics we're looking in two dimensions so we're looking in that kind of x direction and y direction and that's how we're going to describe a vector now what we often use is if we think of one unit in the x direction this we use as i finishing at a coordinate of zero one so it's just one unit in the x direction and then in the y direction we have j and that would go as far as the coordinate zero one okay so one unit in the x direction is i one unit in the y direction is j so if i had say a vector that was 3 a plus 2 j what that means is that we go three units in the i direction okay or x direction then two in the y direction which is oj and this would be our vector there vector a okay and that's what it's all about obviously negative values would then move either left if it's a negative