Name: .................................... Grade : IX IGCSE Worksheet Moments **************************************************************************

1) Why would a mechanic choose a long spanner to undo a tight nut?

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2) A mechanic applies a force of 200 N at the end of a spanner of length 20 cm. What

moment is applied to the nut?

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3) Calculate X, Y and Z in the following diagram:

4) Dawn sits on a seesaw 2.50m from the pivot. Jasmin balances the seesaw by sitting 2.00m

on the other side of the pivot.

(a) Who is lighter, Dawn or Jasmin?

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(b) Jasmin weighs 425 N. What is Dawn’s weight?

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(c) Dawn gets off the seesaw so John can sit on it to balance Jasmin. His weight is 450 N.

How far from the pivot should he sit?

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5) For each of the balanced beams in the figure, work out the unknown weight.