According to the third law of motion when we push on an object,
the object pushes back on us with an equal and opposite force.
If the object is a massive truck parked along the roadside, it
will probably not move. A student justifies this by answering
that the two opposite and equal forces cancel each other.
Comment on this logic and explain why the truck does not
move.
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Because of the huge mass of the truck,
the huge mass of the truck,the force of static friction is very high. The force applied by the student is unable to overcome the static friction and hence, he is unable to move friction and hence, he is unable to movethe truck. In this case, the net unbalanced force either direction is zero, which is the reason of no motion happening here. The force applied by motion happening here. The force applied by the student and the force because of static friction cancel out each other.
Hence, the logic given by he student is correct.
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