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... we are trying to measure. The experiment will be repeated a further 5 times with different weights placed on the block of wood. (200g, 400g, 600g, 800g and 1000g.) F P A gradually increasing force will be applied to the wood at point P . At first the block will remain motionless since an equally increasing but oppositely directed force of friction F, comes into action under the surface of the block. In other words pull P and the opposing frictional force F are in equilibrium. When force P continues to increase a stage will be reached when the block begins to move. At this point, the friction brought into play has reached its maximum value for the two surfaced concerned, and this is called the static friction. I predict that the greater the weight on the wood ...