a person wants to move a 400 kg rock with 5.9 m crowbar. he puts the fulcrum 9 m from the rock. how much force he must use to move the rock.
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Total length = 200cm
Load arm = 50 cm
Effort arm = 200 - 50 = 150 cm
Effort = ?
Load * Load Arm = Effort * Effort Arm
200 kgf * 50 cm = Effort * 150 cm
Effort =200*50/150
=200/3
=66.66 N
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