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3. Another crow-bar is used to lever a load of 120N. The load is 2m from the fulcrum and the effort is 6m from the fulcrum. What effort is required to move the load ? |
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Clockwise moments = 120 N x 2 m Anticlockwise moments = effort x 6m In equilibrium; clockwise moments = anti-clockwise moments 120 x 2 = effort x 6 effort = 120 x 2 6 effort = 240 6 = 40 N An effort of over 40 N is required to move the load. |
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4. A wheel-barrow is used to lift a load of 150N. The wheel acts as the fulcrum. Calculate the effort required. |
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Clockwise moments = 150 N x .5 m Anticlockwise moments = effort x 1.5m In equilibrium; clockwise moments = anti-clockwise moments 150 x .5 = effort x 1.5 effort = 150 x .5 1.5 effort = 75 1.5 = 50 N An effort of over 50 N is required to lift the wheel-barrow. |
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TRY THE FOLLOWING QUESTIONS |
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| 5. A wheel-barrow is used to lift a load of 200N. The wheel acts as the fulcrum. Calculate the effort required. |
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6. A metal bar is used to lever a load of 150N. The load is 1m from the fulcrum and the effort is 6m from the fulcrum. What effort is required to move the load ? |
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7. Another metal bar is used to lever a load of 200N. The load is 3m from the fulcrum and the effort is 2m from the fulcrum. What effort is required to move the load ? |
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