Density, Buoyancy, and Pressure
What is mass?
The amount of matter in a substance.
What is the equation for density?
Density = Mass/volume
What is pressure?
the force that is applied on a unit's surface area
What is a fluid?
Why are they essential for life?
Any substance that flows (liquid or gas).
(many answers)
What is weight?
The force of a gravity exerted on an object
What is volume?
A Measurement of the amount of space occupied by the substance
What is the density of an item that has a mass of 500g and a volume of 50 g/mL?
10g/mL
Your circulatory system is an example of what type of system?
Hydraulic system, because it has fluids.
What is a solid? (explain properties)
The state of matter of a substance that has a definite shape and volume
What is capacity?
The greatest amount of fluid that a container can hold
What is density?
The amount of mass in a certain unit volume of a substance.
What is the density of an item that has a mass of 70g and a volume of 103cm3?
0.68 g/cm3
Are gases or liquids harder to compress, and why?
Liquids are harder to compress because their particles are already closer to one another.
What is a liquid? (explain properties)
The state of matter of a substance that has a definite volume but no definite shape
What is displacement?
To take the place of something else.
What is buoyancy?
the tendency to rise or float in water or air.
OR: the upward supportive force of an object in a fluid.
What is the volume of an item that has a mass of 2 g and a density of 19.32 g/cm3?
1 cm3
Explain Pascal's Law
Pascal’s Law states that a force applied to a fluid is distributed equally through all parts of the fluid.
Used in many hydraulic devices.
What is a gas? (explain properties)
The state of matter of a substance that has neither a definite shape nor a definite volume
What is the Archimedes Principle?
The buoyant force acting on an object equals the weight of the fluid displaced by the object
What is buoyant force?
The upward force exerted on objects submerged in fluids
What is the mass of an item that has a density of 0.0013g/mL and a volume of 550 mL?
0.715 g
Explain fluid mechanics.
Fluid mechanics studies the behaviour of liquids, gases, and plasma at rest and in motion, as well as the forces acting upon them.
Give the 5 major points of the particle theory
1) All matter is made up of very small particles
2) All particles in a pure substance are the same
3) There is space between the particles
4) Particles are always moving
5) The particles in a substance are attracted to each other
What determines if an object floats or sinks?
If the buoyant force is stronger than the force of gravity, the object will float.
If the force of gravity is stronger than the buoyant force, the object will sink.