NEWTON’S LAW

 

Connected Particles

 

·         To find acceleration use F = ma for the whole system

·         To find tension use F = ma for ONE particle (hint: use the particle who’s tension is pointing in the direction of motion)

·         For some questions you will need to use F = ma for each particle and use simultaneous equations.

 

1.          for total system to find a

eg.

T is internal and can be ignored so:

 (for whole)

 

 

2.         Use  for one particle to find T

 

eg.          for (2)

             

 

Connected Particles and Pulleys

 

eg.1)    

 

 for total system to find a

 

 

 for (2) to find T

 

 

eg.2)

 

 for total system to find a

 

 

 for (2) to find T