P11 Equations And Tings

Question 1

Pressure in solids

Answer 1

Pressure = force ➗surface area

Question 2

Law of pressure in liquids

Answer 2

Pressure increases with depth

Question 3

Equation for pressure in liquids

Answer 3

Pressure = height (h) x density (ρ) x gravitational field strength (g)

Question 4

How to measure the pressure of a gas in a container

Answer 4

The amount of collisions off the walls of the container

Can also use P = hpg

Question 5

What happens when you reduce the area inside a container

Answer 5

There is less space so more collisions off the walls, therefore gas pressire increases

Question 6

How to change air pressure

Answer 6

Change in temperature
Volume of container
Change in number of particles

Question 7

Conditions for an object to float

Answer 7

1) Weight has to be equal to the upthrust of the water
2) the object must be less dense than the liquid
3) If the object displaces more than it’s own mass when placed in the water

Question 8

Density

Answer 8

Mass/ volume

Question 9

Why does air pressure decrease with altitude

Answer 9

As you go further up, there is less air above so less force is acting down on you

Question 10

Why do objects in fluids experience upthrust

Answer 10

A partially (or totally) submerged object experiences a greater pressure on the bottom surface than on the top surface. This creates a resultant force upwards. This force is called the upthrust