Saturday 13 August 2011

7.2 Measurement of force

Measuring force

  • The SI unit for measuring force is NEWTON (N).
  • A force can be measured using Spring balance or Newton balance.
  • The reading of the spring balance is the measurement of the magnitude of the force exerted.
  • The spring balance works on the principle that the extension of the spring is directly proportional to the force acting on it.
  • The greater the force acting on the spring, the larger the extension of the spring.
  • Extension of the spring depends on the force of gravity acting on it.


Diagram 1 : Spring balance

Weight VS Gravity

  • The weight of an object depends on pull of gravity.
  • The force of gravity on the moon is only one-six of the force of gravity on earth.
  • Thus, different object will have different weight on the earth and the moon.


Diagram 2 Different size of earth and moon

Calculation 
 
Note : 1 kilogram (kg) = 10 newton


Diagram 3 Weight and Mass

The answer depends on question. If the question wants you to give the answer in g, so, 
convert kg to g. So, after converting, 0.5 kg = 500 g.

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