P11- Force and pressure

Question 1

Pressure def?
Units?

Answer 1

Force per unit area
Pascals (Pa)

Question 2

What happens to the pressure of a liquid with an increased depth, why?

Answer 2

Pressure of liquid increases with depth, greater mass of water above, increased force acting down

Question 3

What happens to the pressure of a liquid with an increased density?

Answer 3

Pressure increases as density increases

Question 4

What is atmospheric pressure?

Answer 4

Air particles colliding with surfaces and creating pressure on them

Question 5

High altitude affecting pressure and density?

Answer 5

Atmospheric pressure decreases, less air above than at a lower altitude
Density decreases

Question 6

What is upthrust in a liquid?

Answer 6

The upward force on an object due to the liquid

Question 7

Float or sink when..
(weight and upthrust)

Answer 7

Float when weight is equal to upthrust
Sink when weight is greater than upthrust

Question 8

What happens to the forces when an object reaches the bottom?

Answer 8

Upthrust and normal contact force balance to equal weight