What are the two factors that affect the frictional force between two surfaces?

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Which are examples of projectile motion? choose all that apply a. a soccer ball rolling across the ground in the northeast direction b. a car turning a corner, so it is heading south c. a javelin flying through the air d. a tennis ball lobbed over the net

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?