ch05-p002 - 2. We apply Newtons second law (Eq. 5-1 or,...

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2. We apply Newton’s second law (Eq. 5-1 or, equivalently, Eq. 5-2). The net force applied on the chopping block is G G G FF F net =+ 12 , where the vector addition is done using unit-vector notation. The acceleration of the block is given by G G G aFFm di /. (a) In the first case () ( ) ( ) ˆˆ ˆ ˆ 3.0N i 4.0N j 3.0N i 4.0N j 0 ªº ª º += + +− + = ¬¼ ¬ ¼ GG so G a = 0 . (b) In the second case, the acceleration
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