Physics 2A

Question 1

Fluid ?
Density +formula?
FLUID DENSITY

Answer 1

And substance that can flow
A measure of the mass per unit volume of a distance
Density(kg m–3)=mass/volume
Same unit as density

Question 2

What has to happen for an object to float?

Answer 2

It has to sink till it’s displaced it’s own weight of fluid. When weight and Upthrust are balanced the object will stop sinking further

Question 3

1.Upthrust?
3.What is Archimedes principle
2.If an object is completely submerged in a fluid, the mass of the fluid displaced is equal to…
3.Weight of fluid displaced is found using….
4.The weight of the fluid is equal to…

Answer 3

1.Upward force caused by fluid pressure
2.When an object is placed in a fluid the weight of the displaced fluid is equal to the Upthrust force
3.The density of the substance X the volume of the object (m=Vp)
4.W=m g
5.The Upthrust force

Question 4

Weight= ….. force
Upthrust= ….. force
So a brick dropped into a volume of water will…

Answer 4

Downward
Upward
Accelerate down until it reaches the ground which then exerts an equal force to balance weight and therefor it rests stationary with no resultant force

Question 5

Hydrometer¿
Upthrust 2 equations:

Answer 5

An object used to determine density of a fluid- it has a constant weight so sinks lower in less dense fluids as a garter volume must be displaced to balance the weight of the hydrometer
Upthrust=mass x 9.81 & Upthrust=pXgXv

Question 6

Laminar flow (streamline)

Why does water always flow faster in center of cylindrical objects

Streamlines

Answer 6

When a fluid moves with uniform lines in which the velocity is constant over time

Outermost layer will experience most free toon with object… second layer less friction with outermost water layer and so on

Lines of laminar flow in which the velocity is constant over time

Question 7

Turbulent flow

Answer 7

When fluid velocity in a particular place changes overtime, often in Ann unpredictable manner- chaotic + Eddies