Science Fluids Flash cards
(15 cards)
Compression
decrease in volume caused by a force
Density
amount of mass contained in a given volume
Flow Rate
measure of the speed at which a fluid flows from one point to another determined by measuring the amount of fluid that flows past a given point in a given time
Viscosity
resistance of a fluid to flow
Pressure
amount of force applied to a given area
Buoyancy
tendency of an object in a fluid to rise or sink due to density differences with its surroundings
Friction
force that opposes the relative motion of an object
Fluids
any substance that flows
Plimsoll Line
line painted on the hull of all cargo ships to show how heavily the ship can be safely loaded in different water conditions
- Know how to calculate density and write it in g/ml
Mass divided by volume
- Be able to explain how your submersible worked (or should have worked). Use words like density and buoyancy.
In order for the submersible to work it needed to sink and float so it had to be denser than the water at one point and the water had to be denser at another point. We placed a hydraulic system in it so we could take out the water when we wanted it to float and we would add the water when we wanted it to sink. The water by itself would not be enough for the submersible to sink so we also added rocks but we had to add enough that it wouldn’t sink without the water.
- Explain what happened to the balloons during our balloons trick lab. Thoroughly explain both what should happen when it is heated and what should happen when the balloon is cooled. Use scientific terms.
During our experiment regarding the balloons we measured two balloons and placed one in cold water and one in hot then after a handful of minutes we measured the circumference of the balloons again. By placing the balloon in cold water it shrunk because the particles moved faster and closer together. The balloon placed in hot water expands because when particles are heated they move slower and farther apart.
- Explain the three scenarios when placing an object in a liquid (found on page 220).
An object will do one of these three things when placed in water it will rise, sink, or float.When the object Rises that is because the density of the object is less than the density of the fluid and the buoyant force is greater than the force of gravity on the object and the object sink that is within the density of the object is greater than the density of the fluid and the buoyant force is less than the force of gravity on the object when the object floats that is because the density of the object is equal to the density of the fluid and the buoyant force to the force of gravity on the object.
- Explain how pressure changes. Give three examples and use scientific terminology. (page 228-229).
Pressure changes with the altitude, temperature,depth and fluid flow. The higher in altitude the less air pressure because the air is less dense. If you were to release a helium balloon there is less air pressure acting on it making the balloon rise and expand. When the temperature inside of a container increases the particles move faster and strike the walls of the container more often and with more energy making the item explode.This would happen if you put a can of beans into the microwave. Depth affects pressure because the lower you go the more force is applied, this occurs when going to the bottom of a swimming pool and feeling the pressure in your ears due to the weight of the water on the top. Fluids will always flow if they can move between a higher pressure and a lower pressure for example when you’re drinking out of a juice box and you’re sucking on the straw in order to drink the juice.
Viscosity increase
cool and take away water
