Algorithm for solving problems by Newton’s laws

1.      

Read the problem

2.      

Decide which physics equations you should use.

3.      

Use a rough sketch to help you see how different parts of the problem are related.

4.      

If the problem is about acceleration then you should also see if it involves polleys

i.        

Use F_net = 0 when there is equilibrium

ii.      

Use F_net = ma when there is no equilibrium

iii.     

Use Torque_net = I? if it involves pulleys

5.      

If the problem has friction then use static coefficient in the case of friction, and kinetic friction in the case dynamic case.

6.      

Identify the subject of the forces; what are the forces acting upon?!

7.      

Draw a coordinate system.

8.      

Draw all the forces with the proper directions.

9.      

Make sure all the angles are properly indicated and their measures are referenced correctly to an axis.

10.  

 Write down Newton’s second law of motion as applied to the problem.

11.  

Now solve the: Depending on the problem, solving Newton’s 2^nd law can give two equations two unknowns to solve. As when we solve the x-component and the y-component.

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