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# Forces in Fluids

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
Created by: stober