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Give an example for each of the following uses of a machine:
to change the point of application of force
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Give an example of the following uses of a machine:
to change the direction of force
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One joule is the amount of work done when a force of ......... moves a body through a distance of .......
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What is the work done when no net force is applied on the body?
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A wheel of diameter 3 m is shown in fig. 2 with axle at 0. A force F = 8 N is applied at Q in the direction shown in figure. Calculate the moment of force about:
(i) centre o, and
(ii) point p.
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Calculate the resultant moment of forces about O and state its direction in fig.
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Fig. 5 shows a uniform meter scale weighing 200 gf. Provided at its centre. Two weights 300 gf and 500 gf are suspended from the ruler as shown in the diagram. Calculate the resultant torque of the ruler and hence calculate the distance from mid-point where a 100 gf should be suspended to balance the meter scale.
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(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.
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Three forces A, B and C are acting on a rigid body which can turn about O in fig.9. If all the three forces are applied simultaneously, in which direction will the body move? Explain.
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Fig. shows a uniform meter scale weighing 100 N pivoted at its centre. Two weights of 500 N and 300 N are hung from the ruler as shown in fig.
(i) Calculate total clockwise and anticlockwise moments.
(ii) Calculate difference in clockwise moment and anticlockwise moment.
(iii) Calculate the distance from O where a 100 N weight should be suspended to balance the meter scale.
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A meter scale is provided at 10 cm mark and is balanced by suspending 400 g from 0 cm mark (fig.). Calculate the mass of meter scale.
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State whether the moment of force is a scalar or vector quantity?
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State two factors affecting the turning effect of a force.
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Write the expression for the moment of force about a given axis.
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