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FORCES - MORE QUESTIONS

V. Ryan 2002 - 2010

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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 ?

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.

 
4. A wheel-barrow is used to lift a load of 150N. The wheel acts as the fulcrum. Calculate the effort required.

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.

 
 
 

TRY THE FOLLOWING QUESTIONS

5. A wheel-barrow is used to lift a load of 200N. The wheel acts as the fulcrum. Calculate the effort required.
 
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 ?

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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