When Push Comes to Shove Two forces, of magnitudes F 1 = 80.0N and F 2 = 25.0N ,
ID: 1280867 • Letter: W
Question
When Push Comes to Shove
Two forces, of magnitudes F1 = 80.0N and F2 = 25.0N , act in opposite directions on a block, which sits atop a frictionless surface, as shown in the figure. (Figure 1) Initially, the center of the block is at position xi = -2.00cm . At some later time, the block has moved to the right, and its center is at a new position, xf = 5.00cm .
Express your answer numerically, in joules.
2. Find the work W2 done by the force of magnitude F2 = 25.0N as the block moves from xi = -2.00cm to xf = 5.00cm .
Express your answer numerically, in joules.
3. What is the net work Wnet done on the block by the two forces?
Express your answer numerically, in joules.
4.Determine the changeKf?Ki in the kinetic energy of the block as it moves from xi = -2.00cm to xf = 5.00cm .
Express your answer numerically, in joules.
When Push Comes to Shove Two forces, of magnitudes F1 = 80.0N and F2 = 25.0N , act in opposite directions on a block, which sits atop a frictionless surface, as shown in the figure. (Figure 1) Initially, the center of the block is at position xi = -2.00cm . At some later time, the block has moved to the right, and its center is at a new position, xf = 5.00cm . Find the work W1 done on the block by the force of magnitude F1 = 80.0N as the block moves from xi = -2.00cm to xf = 5.00cm . Express your answer numerically, in joules. 2. Find the work W2 done by the force of magnitude F2 = 25.0N as the block moves from xi = -2.00cm to xf = 5.00cm . Express your answer numerically, in joules. 3. What is the net work Wnet done on the block by the two forces? Express your answer numerically, in joules. 4.Determine the changeKf?Ki in the kinetic energy of the block as it moves from xi = -2.00cm to xf = 5.00cm . Express your answer numerically, in joules.Explanation / Answer
1) W1 = F1 (0.05 - (-0.02) ) = 80 (0.07) = 5.6 J
2) W2 = F2 (0.07) cos 180 = - 1.75 J
3) Wnet = W1 + W2 = 5.6 - 1.75 = 3.85 J
4) Kf - Ki = Wnet = 3.85 J
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