Questions on Moments
Q3. The drawing shows a very old set of scales. It can be used to check the weights of silver coins.
(a) Jack puts a silver coin in pan X. There is nothing in pan Y.
In which direction does pan X move?
(1 mark)
(b) The table shows the weights of five silver coins.
Silver Coin |
A |
B |
C |
D |
E |
weight in mN |
112 |
106 |
120 |
112 |
98 |
Jack puts one coin in each pan of the scales.
Which two coins will make the scales balance?
(Give the letters).
(1 mark)
(c) Coin A is placed in pan X, and coin C is placed in pan Y.
In which direction does pan X now move?
(1 mark)
(d) In another experiment, coin B is placed in pan X, and one of the other coins is placed in pan Y.
Pan X goes down. Which coin is in pan Y?
Give the letter.
(1 mark)
(e) Jack knows the weights of the five silver coins in the table. He also has a gold coin.
Explain how he could use the silver coins and the scales to find the approximate weight of the gold coin.
(2 marks)
Total 6 marks
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