FFD: Forces, Fluids & Density Flashcards
Particle Theory of Matter
- Theory that explains the behaviour of solids, liquids, and gases.
- It states that all matter is made up of tiny moving particles that attract each other and have spaces between them.
- Adding heat makes particles move faster decreasing density resulting in a state of matter change.
Solid
Particles are close together and in a fixed place; denser than liquids.
Liquid
Particles are close together but can slide around and over each other; denser than gases.
Gas
Particles are far apart and move rapidly.
Fluid
Any matter that has no fixed shape, can flow, and takes the shape of its container; any substance in a gas or liquid state
Viscosity
A liquid’s internal resistance or friction that keeps it from flowing
Weight
Measure of the force of gravity on an object; measured in newtons (N)
Mass
Measurement of the amount of matter that is in an object; often measured in grams
Density
Mass per unit of volume; measure by dividing the mass of a substance by its volume; the amount of matter or number of particles in a given volume; g/mL or g/cm3
D = M/V
Volume
The amount of space taken up by an object; liquids measured by mL and solids measured by cm3
Force
Push or pull that tends to cause an object to move or change its motion; measured in Newtons (N)
Buoyant Force
Upward force that a liquid exerts on an object, opposite to the pull of gravity on an object in a liquid; an important property of fluids; the property that causes a ship to float in water
Gravitational Force
Force trying to pull an object down to the center of the Earth = 9.8m/s2 on Earth
Pressure
A measure of the amount force applied to a particular area; measure in pascals (Pa) = N/m2
Compression
Results when a force pushes on an object
Hydraulic Device
Devices that use water or some other liquid in motion under pressure to do useful work
Hydraulic Fluid
The liquid part put into a hydraulic system
Hydraulic System
System that uses liquids in a confined space to transfer forces; operates according to Pascal’s Law
Pneumatic Devices
Devices that use air or other gases in a confined space or transmit forces
Pneumatic Systems
Confined, pressurized systems that use air or other gases to transmit forces
Variables
Things that can be changed in a scientific experiment
Fair Test
Experiment in which only one variable is changed at a time
Balanced Forces
Opposite and equal forces acting on an object; for an object to remain suspended in water, the downward force of gravity must be balanced by and equal upward force
Newton (N)
The unit used in science for measuring gravitational force, weight, and pressure.
Personal Flotation Device (PFD)
A safety device designed to keep a person afloat in water
Archimedes’ Principle
Buoyant force acting on an object equals the weight, or gravitational force, of the fluid displaced by the object
Swim Bladder
A specialized organ in many fish, containing a mixture of air and water; this organ allows the fish to control it’s swimming depth
Ballast Tank
Tanks in submarines that enable the submarine to dive and resurface; ballast tanks depend on a feature similar to a swim bladder in fish
Water Displacement Method
Method of measuring volume which involves placing an object in a container of water and measuring the amount of water moved (displaced); alternatively, placing an object into a container full of water and measuring the volume of the overflow
Contact Force
Force exerted when two objects are touching one another
Non-contact Force
Force exerted between two things that are not touching
Pascal’s Law
When pressure is applied to a liquid in a container, the pressure and force is transmitted equally and undiminished throughout the liquid; an enclosed liquid transmits pressure equally in all directions
Incompressible
Unable to be compressed easily
Input Device
Device that puts information into a system
Output Device
Part of a system that responds to an input
Mechanical Advantage
The ability to produce an output force larger than the input force
Pump
A machine or device that displaces fluid by mechanical or physical action
Closed Hydraulic System
Hydraulic systems where the liquid cannot leave the system
Open Hydraulic System
Hydraulic systems where the liquid can leave the system; these can be used to transport fluids; Ex: hand pumps for water
International System of Units
System of measurement that is based on powers of 10 and base units such as meters, liters, and grams.
Matter
Anything that takes up space and has mass; can neither be created nor destroyed.
A digital or triple balance scale is used to measure…
Mass
A spring scale is used to measure…
weight and/or force
Glassware, such as beakers and graduated cylinders, are used to measure…
volume
The Greek scientist and mathematician Archimedes discovered this while in the bath tub
The water displacement method
HHPS stands for…
Hazardous Household Products Symbols
WHMIS stands for…
Workplace Hazardous Materials Information System
Which WHMIS symbol is this?

Biohardous Infectious Materials:
for organisms or toxins that can cause disease in people or animals
Which WHMIS symbol is this?

Corrosion:
for corrosive damage to metals, as well as skin and eyes
Which WHMIS symbol is this?

Environment:
may cause damage to the aquatic environment
Which WHMIS symbol is this?

Exclamation Mark:
may cause less serious health effects or damage the ozone layer
Which WHMIS symbol is this?

Exploding Bomb:
for explosion or reactivity hazard
Which WHMIS symbol is this?

Flame Over Circle:
for oxidizing hazards
Which WHMIS symbol is this?

Gas Cylinder:
for gases under pressure
Which WHMIS symbol is this?

Health Hazard:
may cause or suspected of causing serious health effects
Which WHMIS symbol is this?

Skull and Crossbones:
can cause death or toxicity with short exposure to small amounts
Which WHMIS symbol is this?

Flame:
for fire hazards
These HHPS symbols mean:

- Danger Flammable
- Danger Poison
- Caution Explosive
- Danger Corrosive
Methods/Tests used to measure viscosity:
- Bubble Test - How long it takes an air bubble to rise through a tube of fluid. The longer it takes for the bubble to travel through a fluid, the higher the viscosity.
- The Ramp Method: How long it takes a fluid to flow down a ramp. The longer it takes for a fluid to flow down a ramp, the higher the viscosity
Air pressure at sea level is…
101.3 Pa
Gravitational force on Earth is equal to…
9.8 m/s2
Compressibility
the ability to become more compact when squeezed
An example of a hydraulic system in the human body is our…
Heart
An example of a pneumatic system in the human body is our…
Lungs
If temperature increases then viscosity…
decreases and vice versa
If the buoyant force is greater than or equal to the gravitational force then the object…
floats
If the gravitational force (a.k.a. weight) on an object is greater than the buoyant force then the object…
sinks
If mass increases then density…
increases and vice versa
If the temperature increases then volume…
increases and vice versa
If the volume increases then density…
decreases and vice versa
If the temperature increases then pressure…
increases and vice versa
If the force increases then the pressure…
increases and vice versa
If the area increases, then the pressure…
decreases and vice versa