(c) Aheavy rock can be lifted easily by using a crowbar. Explain.
Answers
Point C is the spot where the force is being applied to lift the heavy stone. The upward force applied is called F. ... It means a force 5 kg will be able to lift the 50 kg stone with a rod of 6 feet length (BC+ BA). This is how a crow bar is used.
Answer:
Heavy stone is lying on ground. It's weight (Load, call it L) is acting perpendiular down through its center of gravity. This Load is passing through Point A, where the load is resting on ground.
A long rod is inserted below the stone. It makes contact with the stone at Point B. This is the fulcrum, which will cause the stone to move.
Point C is the spot where the force is being applied to lift the heavy stone. The upward force applied is called F.
Now, Length of Power Arm ,BC* Force F = Load Arm, BA* Weight of Stone
Therefore Force F = Load Arm, BA* Weight of stone/Length of Power Arm, BC………..Call this equation as EQ.
Assume Weight of stone= 50 kg, Length of Power arm, BC = 5 Feet, Length of Load arm, BA = 1 foot.
Substitute these values in equation EQ.
F= 1*50/10. Therefore F= 5kg. It means a force 5 kg will be able to lift the 50 kg stone with a rod of 6 feet length (BC+ BA). This is how a crow bar is used.
It is an oversimplified example of using a lever that gives substantial mechanical advantage.
Explanation:
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