The Apple, Hand and the Earth

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Presentation transcript:

The Apple, Hand and the Earth Created for BW Physics By Dick Heckathorn 5 March 2K + 8

2.

w is exerted by earth on apple. Fe on apple

n is exerted by hand on apple. Fhand on apple n

How is Fh on a related to Fe on a? Fhand on apple (equal) (same magnitude) ? Are not equal as they are in opposite directions. Fe on apple 3b.

What is the net force on the apple? Fhand on apple (zero) (nonzero) ? Why? The apple is not moving. Fe on apple 3d.

Note that both forces are acting on the same object. are they an action-reaction pair? Since Fh on a and Fe on a are equal & opposite, (they are) Fhand on apple (they are not) ? Note that both forces are acting on the same object. Fe on apple 3d.

The reason is…they act on: Fhand on apple the same object different objects ? Thus we can say… Fe on apple 3d.

If the action force is the earth pulling on the apple then the reaction force is the apple pulling on the earth. Fa on earth Fearth on a 3d.

Thus we can see that Fh on a and Fe on a are Fhand on a equal and opposite and… do do not comprise an action-reaction pair. Fearth on a 3f.

Another pair of forces are… comprise and action-reaction pair. Fhand on apple This force pair does does not comprise and action-reaction pair. Fapple on hand 3g.

There is a net force up on the apple of 2-N Nellie now pushes upward with her hand on the apple with 2-N of additional force. What does the apple do? still at rest accelerates up New Fhand on a Why? There is a net force up on the apple of 2-N Fa on hand 3h.

The force of the hand on the apple is: the net force on the apple is: Once the apple leaves the hand… The force of the hand on the apple is: Fh on a the net force on the apple is: Thus the apple begins to slows down. Fe on apple 3d.

That’s all folks!