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Forces in Fluids
Question | Answer |
---|---|
Weight | The amount of force pulling down on an object. Expressed in Neutons |
Mass | The amount of matter in an object. Expressed in gm or kg |
Density | The amount of mass in an object compare to it's volume. Formula is D= M/V |
What is the density of water? | 1 gm/ml or 1kg/l |
What can density be used to determine? | If an object will sink or float- the object's bouyancy |
Why do some things float while others sink? | Water has a density of 1gm/ml. If an object has a greater density, it sinks. If an object has a smaller density, it floats |
Displacement | The result of an object pushing a fluid out of the way. The volume of the object that is below the surface of the fluid. |
Displacement | The result of an object pushing a fluid out of the way. The volume of the object that is below the surface of the fluid. |
Buoyancy | The upward force of a fluid on an object |
Fluid | A substance that flows with no shape (a liquid or gas), but can fill the space of its container |
Pressure | The amount of force exerted on an object in a certain area. Formula is P= F/A |
Volume | The amount of space occupied by an object |
How does density affect buoyancy? | The denser the fluid is the more buoyant force it has on an object. |
Archimedes Principle | The weight of the water displaced by an object is equal to the buoyant force. For example, 5 L of water weighs 5 kg. 5 kg x 10 = 50N. Therefore, bouyant force is 50N |
Atmospheric Pressure | The pressure caused by the weight of the atmosphere. |
Pascal's Principle | A change in pressure at any point of an enclosed fluid (i.e. hydraulics) will be transmitted equally to all parts of the fluid. |
Pascal | a unit of force. 1Pa = 1N/meter squared |
Bernoulli's Principle | As the speed of a moving fluid increases, its pressure decreases |
Lift | Upward force on a wing due to high pressure below the wing and low pressure above the wing. |
Thrust | the forward force of an airplane that influences its speed. |
Drag | The force that opposes or restricts movement of a fluid |