A packing case is being lifted vertically at a constant speed by a cable attached to a craneThe packing case has mass of 640kg.(a) With reference to one of Newton's laws of motion, explain why the tension T, in the cable must be equal to the weight of the packing case.
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The key words here are constant speed; in other words, the crate is not acceleratingThat means there is NO net force acting on the crate (Newton's First Law: An object resists acceleration unless acted upon by a net force)(Newton's Second Law: The magnitude of an object's acceleration is directly proportional to the net force acting on it.no net force no acceleration)So either way you look at it, the tension lifting the crate must exactly equal its weightIf the tension were greater than the box's weight, there would be a net UPWARD force and the box would be accelerating upwardIf the tension were less than the box's weight, there would be a net DOWNWARD force and the box would be accelerating downwardI hope that helpsGood luck!