A block with mass m1=8.8 kg rests on the surface of a horizontal table which has a coefficient of kinetic friction of uk= 0.58. A second block with a mass m2= 10.8 kg is connected to the first by an ideal police system such that the second block is hanging vertically. The second block is released emotion occurs. Using a variable T to represent tension, right expression for the sum of the forces in the Y direction. ∑Fy, for block 2. Using the variable T to represent tension, write an expression for the sum of the forces in the X direction,  ∑Fox, for block 1. Write an expression for the magnitude of the acceleration of block 2, a2, in terms of the acceleration of block 1, a1. (assume the cable connecting the masses is ideal.) Write an expression using the variables provided for the magnitude of the tension force, T. What is the tension, T in Newton’s? 

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”