AS Module 1

AS Physics unit 1

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AS Module 1 by Mind Map: AS Module 1

1. Fluids

1.1. Density

1.1.1. Density = mass / volume

1.1.2. Pressure = height x density x gravitational field strength

1.2. Flow

1.2.1. Laminar Flow At low Flow rates laminar flow occurs, with smooth streamlines and very little friction between layers. It has a conical velocity profile.

1.2.2. Turbulent Flow At high flow rates turbulent flow occurs, with eddies and a flat velocity profile.

1.3. Viscosity

1.3.1. Temperature The higher the temperature the lower the viscosity.

1.3.2. Experiment liquid flowing through a small tube with a constant head of pressure. Measure time for volume of liquid to flow through. Repeat for range of temperatures of liquid

1.4. Forces

1.4.1. Viscous Drag When objects move through fluids they experience viscous drag. This depends on the viscosity of the fluid. Stokes Law F=6πnrv

1.4.2. Terminal velocity When weight = viscous drag + upthrust the object stops accelerating and reaches terminal velocity

1.4.3. Upthrust The upwards force on an object in a fluid. The upthrust equals the weight of fluid displaced an object floats if upthrust = weight

2. Solids

2.1. key terms

2.1.1. Hard Whether or not it can be scratched by other materials.

2.1.2. Tough How well it can withstand impacts, measured by the area under a stress strain graph

2.1.3. Brittle An object that does not deform plastically

2.1.4. Malleable Can be hammered into shape

2.1.5. Ductile Can be drawn into wire

2.1.6. Stiff The more force needed to achieve a fixed extension the stiffer the material. The greater the gradient of stress strain graph the stiffer.

2.1.7. Strong How much force is needed to break it. The higher the line goes on a force extension graph the stronger.

2.2. Stretching solids

2.2.1. Stress The extension / original length

2.2.2. Strain New node

2.2.3. Youngs Modulus

2.2.4. Stress Strain Graphs