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Hi.

My English is not perfect but I'll try my best. This is not a homework. It's a programming question for my simulator project.

Scenario:

- A pencil standing in your hand. It will fall or stand depending on how you move your hand.

- Let's assume that the hand is just an ideal 'plane'.

- Let's assume that a pencil is just a simple, ideal rectangular rigid body object.

- *** Let's assume that a pencil will NOT fall on y-axis. Or in English: It will only fall to the left or right.

Variables I have:

- Real-time 'Acceleration' of my hand in x axis. (in m/s/s)

- 'Mass' and 'Volume' of a pencil.

Variables I need:

- The change of 'theta'(angle) between the pencil and my hand(in x-axis) in each time slice. Or you could say d(theta) by d(t)

Questions:

What topic should I research for to relate the acceleration to the angle changes?

note:

*** Actually I want to do x,y and z axis but I think if I know how to solve one, I should be able to solve other too.

Thank you in advance! Please let me know if I didn't provide enough information to the problem.

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# Keeping a pencil standing on your hand What physics topics should I research?

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