Fluids Flashcards
Why do thin bicycle tires require more pressure in them than thick car tires even though cars weigh more than bikes.
Pressure is the force that is divided over a particular area. Since bicycle tires tires do not have much area in contact with the ground the require a greater pressure to exert enough force to keep from flattening.
What is the SI unit of pressure?
Pascal
Which of the following substances are fluids?
Carbon Dioxide,Iron, Molten Steel, Nitrogen, Plastic, Soda,
Fluids have the ability to flow and change shape. They may, but do not need to have a definite volume.
What is atmospheric pressure?
The pressure caused by the weight of the atmosphere above you at a particular point.
What is the air pressure at sea level?
101 kPa
What principle describes how balloons hold their shape?
Pascals Principle- States that the pressure is transmitted in all directions through the fluid.
Explain how a hydraulic system like on a backhoe works?
It multiplies force through moving a liquid through a confined space. According to Pascals Principle that pressure is transmitted in all directions through the fluid.
What is Bernoulli’s principle?
Describes the relationship between the speed of a fluid and the pressure it exerts. Explains how airplane wings give lift.
How do airplane wings work?
The air that flows over the top of the wing travels a larger distance and moves faster than the air that moves under the wing. This creates less pressure on top of the wing creating an upward lift force.
Why do balloons float?
The balloon is less dense than the surrounding air causing it to float on top.
