upthrust and atmospheric pressure Flashcards
1
Q
when an object is sumberged in a fluid what happens
A
The fluid exerts a force on it from every direction
2
Q
pressure increases with
A
Depth so the force exerted at the bottom is larger than the force acting on the top
3
Q
If the upthrust on an object is equal to the objects weight,what will happen
A
Forces balance and the object floats
4
Q
whether an object floats depends on
A
Density
5
Q
what is atmospheric pressure
A
it is created on a surface by air molecules colliding with the surface
5
Q
what is atmospheric pressure
A
it is created on a surface by air molecules colliding with the surface
6
Q
why does atmospheric atmospheric pressure decrease as the altitude increases
A
Their are fewer air molecules that are able to collide with the surface
