Question | Answer |
Weight | Mass x acceleration due to gravity |
Direction of weight | Towards the centre of the planet |
Unit of weight | Newton (as it is a force) |
Measurement of weight | Newton spring balance |
Centre of gravity | The point at which the whole weight of a body appears to act |
Friction | A force that opposes the motion of body |
Lubricant | Reduces friction |
Types of friction | Dry friction (between solid surfaces); Fluid friction (between layers of a fluid); Lubricated friction (when a fluid separates two solid surfaces) |
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