Ch11 Force and Pressure

Question 1

Pressure(Pa)

Answer 1

Force(N)/Area(m^2)

Question 2

How does a smaller area affects pressure

Answer 2

It increases the pressure (p=F/a)

Question 3

Pressure of a liquid column

Answer 3

p= height x density x gravitational field strength

Question 4

Atmospheric pressure

Answer 4

created due to air molecules colliding with surfaces p =f/a
exerting a large force because of the large amount of molecules

atmospheric pressure decreases with an increase in height

Question 5

increasing altitude affect on atmospheric pressure

Answer 5

atmospheric pressure decreases with increasing altitude(density of atmosphere increases with increasing altitude and p= density x g x h). fewer molecules so fewer impacts

Question 6

Earths atmospheric pressure

Answer 6

100kPa at sea level

Question 7

upthrust

Answer 7

submerged object experiences a greater pressure on the bottom surface than on the top surface because pressure increases with depth
creates a resultant force upwards

Question 8

flotation/sinking

Answer 8

an object floats when its weight is equal to the upthrust

an object sinks when its weight is greater than the upthrust