P11

Question 1

Pressure

Answer 1

Pressure (Nm2)(Pa) = Force(N)
———
Area(m2)

Question 2

Pressure 2

Answer 2

Pressure = Height x Density x 9.8 (Gravity)

Question 3

Pressure along a horizontal line

Answer 3

Pressure along a horizontal line in a liquid is constant

Question 4

Why does a dam have a thicker bottom than top?

Answer 4

Because the bottom of the dam is exposed to more water pressure than the top so it needs to counteract the pressure with a thicker stronger wall.

Question 5

What is atmospheric pressure

Answer 5

Atmospheric pressure is created on a surface by air molecules colliding with the surface.

Question 6

What is the general trend with atmospheric pressure?

Answer 6

As the altitude increases, the atmospheric pressure decreases.

Question 7

What is upthrust?

Answer 7

Upthrust is when a force is exerted on the bottom of the object which is greater than the force being exerted on the top of the object.

Question 8

What happens when an object floats?

Answer 8

When an object floats, the Weight of the object is Equal to the Upthrust.