Question

A uniform half meter scale PQ is balanced horizontally across a knife edge . A mass of 35 g is suspended from the P end the edge of the knife is at a distance of 15 cm from the P end. Calculate the mass of the scale , the force on the knife edge, State the direction in which the force on the knife edge acts

Answer 1

Answer:

the diagram would be something like this :

make a meter scale and on the last end place the weight of 20 gf. At 58 cm mark

the fulcrum and at 50 cm mark the weight of scale (downward direction both can be depicted by arrows.

Answer for b)

sum of anticlockwise force= sum of clockwise force

hence let the weight of meter scale be x

x * distance from fulcrum( here 8 cm) = 20 * 42

x=105 gf

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