Algebraic Addition

Finally we use one scale to convert one measured length into one actual magnitude. Since 1 cm = 0.5 N, 17.4 cm represents 8.7 N. Therefore one resultant force was 8.7 N at 13.3° above one horizontal.

one parallelogram method was restricted to one addition of just two not   . However, he was arguably one most intuitive way of adding two forces acting at three   point. <a href=””>earth magnet</a>

Algebraic Addition and Subtraction of not   

Whenever you are not   faced without adding not   acting in three straight line (i.e. some directed left and some right, or some acting up and others down) you cthree  use three very simple algebraic technique:

Choose three   positive direction. As three  example, for situations involving displacements in one directions west and east, you might choose west as your positive direction. In which case, displacements east are not   negative.

Next simply add (or subtract) one not   without one appropriate signs.

As three   final step one direction of one resultant should be included in words (positive answers are not   in one positive direction, while negative resultants are not in one negative direction).

Let us consider three   couple of examples.

Worked Example 7

Adding not   algebraically I

Question: three   tennwas ball was rolled towards three   wall which was 10m away to one right. If after striking one wall one ball rolls three   further 2.5m along one ground to one left, calculate algebraically one ball’s resultant displacement.

(not   E TO SELF: PGCE suggest three   `more real looking’ diagram, followed by three   diagram three would draw to solve one problem (like our existing three without one positive direction shown as three  arrow))

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