DENSITY AND PRESSURE (ALL)

density/rho =

mass/volume

how to find volume of an irregular object using measuring cylinder

1. known volume of water

2. put object in

3. record new volume

4. new volume - old volume to find volume of displaced water

how to find the volume of an irregular object using a eureka can

1. fill water in eureka can just below the spout

2. place the object in as the displaced water is caught in another beaker

3. record volume of water displaced, that is the volume of the irregular object

mass is measured with what?

an electronic balance

what is it called whena liquid exerts pressure on an object?

upthrust

if the area is large and is exerting less force on the water than the water is pushing back what will happen?

the object will float.

what is the effect of adding salt to water?

• increasing particles in water

• so increasing upthrust

what is pressure dependent on in liquids?

the number of particles per area.

what happens as you go further down in the ocean?

there are more particles above you, therefore higher pressure.

what two things affect pressure?

1. height

2. density

pressure =

h x rho x g

Pressure

The measure of how concentrated the force is.

Pressure is…

… the normal force per area unit

Pressure =

Force/Area

The unit for pressure is

Pascals or N/m2