The figure provided shows a hand pushing a 13.2 kg block. The two blocks, 13.2 kg and 28.6 kg, are attached to a string and move along a frictionless surface. Which of the following is true? Assume the string to be massless. The force of the string on the 28.6 kg block is equal to the force of the hand on the 13.2 kg block. The force of the string on the 28.6 kg block is larger than the force of the hand on the 13.2 kg block. The force of the string on the 28.6 kg block is smaller than the force of the hand on the 13.2 kg block.
Question
The figure provided shows a hand pushing a 13.2 kg block. The two blocks, 13.2 kg and 28.6 kg, are attached to a string and move along a frictionless surface. Which of the following is true? Assume the string to be massless. The force of the string on the 28.6 kg block is equal to the force of the hand on the 13.2 kg block. The force of the string on the 28.6 kg block is larger than the force of the hand on the 13.2 kg block. The force of the string on the 28.6 kg block is smaller than the force of the hand on the 13.2 kg block.
Solution
The force of the string on the 28.6 kg block is equal to the force of the hand on the 13.2 kg block. This is because, in an ideal physics world where the surface is frictionless and the string is massless, the force exerted on one end of the string is the same as the force exerted on the other end of the string. This is due to Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. Therefore, the force that the hand exerts on the 13.2 kg block is transmitted through the string to the 28.6 kg block.
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