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# Friction and velocity

at the same time a block of iron and an equally heavy iron sphere are released from the top of the slope assume that the friction between the slope has a negligible effect on the velocity of the block and the sphere.wich of the two will be down first?
Question asked by: Zain uddin

Asked on: 13 Apr 2008

They fall at the same rate and therefore hit the ground at the same time if they weight the same.

This is because of what is known as a gauge symmetry in gravity - drop different items but of the same weight from the same height and they will hit the ground at the same time, just as the same amount of energy would need to be expended to get them to that height whatever the route, so similarly they will hit the ground at the same time.

By: knowitall
Replied at: 27 Apr 2008

Average rating for this answer is 4 / 5

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Question Keywords

velocity  friction

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