Newtonian Forces

 Tension is the pulling force away from an object usually by a string, rope, or cable  Force is represented by mg ◦ M stands for the mass of the object ◦ G stands for the gravity constant on Earth (9.80 m/s 2 ) T -mg

(down) m 2 g |a| Atwood Machine T T

 The difference in the weights makes the acceleration go up  The sum of the weights makes the acceleration go down  (m 2 + m 1 )a = (m 2 + m 1 )g  Inertial mass = (m sys )a  Gravitational mass = (m sys )g  Inertial mass of the system ≠ gravitational mass of the system

 A new rope means you have two separate tensions T1T1 T1T1 T2T2

 Always acts against the motion θ θ mg || mg | -mg

 | F fr |= μ s N or | F fr |= μ k N ◦ Where μ s is the static friction constant and μ k ◦ is the kinetic friction constant ◦ μ k is like skating on ice  Pure slippage ◦ μ s N is like rubber on concrete  Very little motion

 | F fr |≤ μ s N ◦ The static friction has a maximum balancing force -mg sinθ mg sinθ θ