A toy train engine pulls two trailers of masses 1 kg and 2 kg attached through a massless inextensible string with a force of 5 N. The blocks move in the positive x-direction with constant speed. What is the net force acting on the 1 kg block?[Ignore all the vertical forces. All surfaces are frictionless.]
Question
A toy train engine pulls two trailers of masses 1 kg and 2 kg attached through a massless inextensible string with a force of 5 N. The blocks move in the positive x-direction with constant speed. What is the net force acting on the 1 kg block?[Ignore all the vertical forces. All surfaces are frictionless.]
Solution
To find the net force acting on the 1 kg block, we need to consider the forces acting on it.
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The force applied by the toy train engine: The engine pulls the two trailers with a force of 5 N. Since the 1 kg block is one of the trailers, it experiences a force of 5 N in the positive x-direction.
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The force due to the tension in the string: The string connecting the two trailers is massless and inextensible. Therefore, the tension in the string is the same throughout its length. Since the 1 kg block is connected to the 2 kg block through the string, it experiences a tension force in the positive x-direction.
Since the blocks are moving in the positive x-direction with constant speed, we can conclude that the net force acting on the 1 kg block is zero. This means that the force applied by the toy train engine (5 N) is balanced by the tension force in the string.
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