Grade Eight Science Notes – Unit Two (Fluids)

Unit 2 Notes-Fluids  1

Guiding Question: How can we develop a fluid system to improve another country?  1

Area of Interaction: 1

Learner Profile: 1

What is a Fluid?  1

Pascal’s Law: 2

Hydraulic System: 2

The Particle Theory of Matter: 2

Comparing Densities: 3

Calculating Pressure: 3

Viscosity and Flow Rate: 3

Buoyancy: 3

Nov 10/09

Unit 2 Notes-Fluids Guiding Question: How can we develop a fluid system to improve another country? Area of Interaction:

Ø  Approaches to Learning

Ø  Human Ingenuity

Ø  Health and Social Education

Ø  Environments

Learner Profile:

Ø  Caring

Ø  Reflective

Ø  Thinker

Ø  Inquirer

Ø  Communicator

Nov 12/09

What is a Fluid?

A fluid is any substance that flows, but cannot heap, which are liquids and gases.

Pascal’s Law:

When force is applied to an enclosed fluid, the increase in pressure is applied to all parts equally.

Hydraulic System:

1.      How does it work?

2.     What are the parts?

3.     How do they work?

1.      Up valve rises and oil from the tank goes through the pump and pushes the piston up.

2.     Up valve closes.

3.     Oil from cylinder is pressured to go upwards to the down valve.

4.     The down valve rises, and the oil is let back into the tank.

5.     Repeat the process

1.      Up valve, cylinder, piston, down valve, tank of oil and pump.

2.     If you push it forward, it will rise the end part and will let oil through. It will close upon release of handle.

3.     Piston applies force to an outside object and rises as oil is pushed through from the tank.

4.     Cylinder is the space for oil to put pressure to the piston.

5.     Down valve is pushed forward to allow the pressurized oil to flow back to the tank of oil