Block 1 (7.5 kg) is resting on the surface of a table. A hand pushes vertically down on block 1 with a force of 240. N. On a sheet of paper, draw the free body diagram for block 1 using the two-subscript notation from class. After completing the free body diagram, enter below each force and its x & y-components. Remember that the x-component is the "i" component and the y-component is the "j" component. FORCES on BLOCK 1 Weight force on block 1 by Earth:  (two-subscript notation) Value =  i +  j N Normal force on block 1 by Hand:  (two-subscript notation) Value =  i +  j N Normal force on block 1 by Surface:  (two-subscript notation) Value =  i +  j N

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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?”