Particle Theory /
Théorie particulaire
Théorie particulaire
Quels sont les trois points principaux de la théorie particulaire ?
All matter is made of particles, they are always moving, and move faster when heated.
Qu’est-ce que la viscosité ?
A fluid’s resistance to flow.
Quelle est la formule de la densité ?
Densité = Masse ÷ Volume
Que se passe-t-il avec la pression quand on va plus profond ?
Elle augmente.
What is a fluid system?
A system that uses a fluid to perform a task.
What state of matter flows and has no fixed shape?
Liquid or gas.
Quel fluide a une plus grande viscosité : le sirop ou l’eau ?
Le sirop.
What will happen if an object is more dense than water?
It sinks.
What is pressure?
Force applied over a surface area.
Quelle est la différence entre hydraulique et pneumatique ?
Hydraulics = liquid; Pneumatics = gas.
Why does a balloon expand in hot water?
The particles move faster and spread out.
Which flows faster: low-viscosity or high-viscosity fluids?
Low-viscosity fluids flow faster.
What causes objects to float?
They are less dense than the fluid.
What happens to air pressure as you go higher in altitude?
It decreases.
Give an example of a hydraulic system.
Car brakes, excavators, etc.
Pourquoi les gaz se compressent-ils plus facilement que les liquides ?
There is more space between gas particles.
What happens to viscosity as temperature increases?
Viscosity decreases.
What is buoyant force?
The upward force a fluid exerts on an object.
Pourquoi les oreilles « pop » quand l’altitude change ?
To equalize internal and external pressure.
Give an example of a pneumatic system.
Dentist’s drill, air tools such as screw gun, etc.
Que se passe-t-il avec les particules quand un fluide refroidit ?
They move slower and come closer together.
Name one way to measure flow rate in an experiment.
Measure how long it takes a fluid to travel a set distance.
Why do boats float even if they’re heavy?
Their shape displaces enough water to equal their weight.
How is pressure in a fluid transmitted?
Evenly in all directions.
Why are fluids ideal for transmitting force?
Because they flow and distribute pressure evenly.