Flashcards in P2.3.4 - Pressure in Liquids Deck (6)
Why do objects float in water?
- There is a force on the bottle from the air molecules hitting it and the water molecules hitting it.
- There are more frequent collisions due to the water molecules than the air molecules.
- So there is a net force upwards which balances the weight and it floats.
Describe what happens to water pressure the deeper you go under water.
Pressure increases the deeper you go.
Because there is a greater weight of particles on top.
If you double your depth under water, you will double the water pressure.
What is water pressure?
Where water molecules collide with the surface of an object.
Why does the wall of a dam need to be thicker at the bottom?
Because water pressure increases the deeper you go.
There is a greater weight of particles.
This stops the dam bursting.
In which direction does water pressure act?
Can water be compressed?
No because its particles are touching.