Stress, Strain & Quicksand: Crash Course Engineering #12

The video introduces fluid mechanics, explaining its significance in understanding how fluids like air and water interact with objects. It covers the concepts of systems and surroundings, emphasizing the importance of considering external factors in engineering. The video delves into stress, strain, and viscosity, explaining how these factors affect fluid movement. It also discusses Newtonian and non-Newtonian fluids, highlighting their differences. The work of Osborne Reynolds is explored, focusing on his experiments with fluid flow and the development of the Reynolds number, which helps determine the type of flow in a fluid system.

What is the primary medium that affects us in our environment, as discussed in the introduction to fluid mechanics?

• Gas

• Solid

• Fluid

• Liquid

In the context of fluid mechanics, what does the no-slip condition refer to?

• Fluids changing color

• Fluids evaporating

• Fluids sticking to surfaces

• Fluids slipping over surfaces

How is viscosity defined in fluid mechanics?

• A measure of fluid's color

• A measure of fluid's resistance to flow

• A measure of fluid's temperature

• A measure of fluid's density

What distinguishes a Newtonian fluid from a non-Newtonian fluid?

• Newtonian fluids change viscosity with stress

• Non-Newtonian fluids are always thicker

• Non-Newtonian fluids have constant viscosity

• Newtonian fluids have constant viscosity regardless of stress

What happens to quicksand when stress is applied to it?

• It evaporates

• It becomes less viscous

• It solidifies

• It becomes more viscous

What type of flow is characterized by a Reynolds number lower than 2,100?

• Laminar flow

• Transitional flow

• Turbulent flow

• Chaotic flow

What is the significance of the Reynolds number in fluid mechanics?

• It predicts fluid flow behavior

• It calculates fluid density

• It measures fluid temperature

• It determines fluid color