cranes should fall backwards when not lifting anything because they have large counterbalances to counteract the forward force of lifting something. Why don't they?
2006-08-23 02:34:38 · 7 answers · asked by Dan the man 1 in Science & Mathematics ➔ Physics
cranes should fall backwards when not lifting anything because they have large counterbalances to counteract the forward force of lifting something. I could understand if the counterbalances moved towards the centre when not lifting, so as to reduce the backward force, but they do not. Why don't they fall backwards?
2006-08-23 02:43:44 · update #1
they are structurally designed to take the weight of the counter balance and when you try to lift something so heavy that it becomes unequal at both ends it cancels the operation and most cranes don't have a movable counter balance
2006-08-24 08:58:05 · answer #1 · answered by eirebandit 1 · 0⤊ 0⤋
Because they are stuck to the ground. The weight imbalance at the top of the crane, whether by lifting or not, is counteracted by a torsional force at its base.
Imagine holding one end of a horizontal pencil. Your fingers exert a twisting action to counteract its weight at the other end. Same (ish) principle.
2006-08-23 02:48:28 · answer #2 · answered by myownprivateroad 3 · 0⤊ 0⤋
for the same reason they don't fall forward when lifting something.......good design.low centre of gravity,movable counterbalance.
2006-08-23 02:41:52 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Because the counterweights move to compensate.
2006-08-23 02:36:32 · answer #4 · answered by JeffE 6 · 0⤊ 0⤋
What a great questions, I never thought about it
2006-08-23 02:40:36 · answer #5 · answered by halloweenpumpkinuk 4 · 0⤊ 0⤋
low center of gravity, like your fat azz
2006-08-23 02:36:34 · answer #6 · answered by Anonymous · 0⤊ 0⤋
skyhooks.
2006-08-23 04:20:39 · answer #7 · answered by Silver Fox 2 · 0⤊ 1⤋