Physics, 02.07.2019 09:00 gshreya2005

Which free body diagram is in equilibrium? a b both a and b. neither a nor b.

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The block in Diagram-A is in equilibrium. The horizontal forces acting on it add up to zero, and the vertical forces acting on it also add up to zero. Since the block is in equilibrium, it will move in a straight line with a constant speed. It won't speed up, slow down, or move in a curve, until one of the forces on it now changes size or direction, or some new force shows up.

The block in Diagram-B is NOT in equilibrium. It has a net force acting on it ... 5 Newtons to the left. That block will accelerate to the left.

Note: If you want to come right down to it, Diagram-B is actually absurd. The horizontal force pointing to the left is labeled "Force of friction", which is silly. Friction is not actually a real force, even though it may behave like one in some situations. For example, friction can never ADD mechanical energy to an object, or INCREASE the object's velocity. In Diagram-B, there could never be a force of 5N due to friction acting on the block and pointing to the left, without something else going on. It's only when you try to pull the block to the right with REAL force, that a left-pointing force ... due to friction ... SEEMS to show up. That's why friction is called a "pseudo force".

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Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by mathematical calculations before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of uranus led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

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Which free body diagram is in equilibrium? a b both a and b. neither a nor b....

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