Rotational Kinematics/Dynamics and Fluids Flashcards Preview

OAT- Physics > Rotational Kinematics/Dynamics and Fluids > Flashcards

Flashcards in Rotational Kinematics/Dynamics and Fluids Deck (34)
Loading flashcards...
1
Q

Formula for Angular velocity

A

ω = (θf - θi) / t

2
Q

Formula for Angular acceleration

A

α = ω/t

3
Q

How is angular velocity affected by the position of the object

A

The angular velocity remains the same independently of the objects position

4
Q

How is translational velocity affected by the position of the object

A

The farther you are from the center the more translational velocity you have

5
Q

I rev is equal to

A

6
Q

Center of mass formula

A

Xcm = (m1x1 + m2x2 +…./m1+m2+…)

7
Q

Formula for torque

A

τ = F*l (perpendicular force x lever arm) or τ = Iα (inertia x angular acceleration)

8
Q

When approaching torque problems, which force do you use

A

Only use the perpendicular force

9
Q

Formula for Inertia

A

I = (mr^2)

10
Q

Mass distributed towards the outside

A

Has more intertia

11
Q

Mass distributed towards the inside

A

Has less inertia, will reach bottom first (solid)

12
Q

Formula for Angular Momentum

A

L =Iω

13
Q

Formula for Rotational KE

A

KE = 1/2(Iω^2)

14
Q

What are the values of force and torque during static equillbirum

A

F=0

τ = 0

15
Q

How does the gravity of an object relate to the specific gravity of H2O

A

If an object has 2x the gravity of H2O, then its specific gravity is 2.

If its gravity is 1/2 of H2O then the SG is 1/2 etc.

16
Q

Formula for pressure

A

P = F/A

17
Q

Units for pressure

A

1atm = 760 torr = 760mmHg = 100,000Pa

18
Q

Formula for Hydrostatic Pressure

A

p = ρ(fluid) x g x h(depth)

19
Q

Every 10m depth in H2O equals

A

1 atm pressure

20
Q

Air can be looked at as a fluid in that

A

The deeper you go the more the pressure increases

21
Q

When the liquid levels are equal

A

The pressure inside will equal the pressure in the external environment

22
Q

Formula for Buoyancy Force

A
Fb = ρgV 
Fb = buoyant force of a liquid acting on an object 
ρ = density of the liquid
g = gravitational acceleration
V = volume of liquid displaced
23
Q

If the object is floating the buoyancy force will equal

A

The objects weight

24
Q

Formula for % submerged

A

(Density of object / density of fluid) x 100

25
Q

The difference in height between the fluid is equal to the

A

Difference between the pressures

26
Q

Formula for Specific Gravity

A

SG = (density of substance)/(density of H2O)

27
Q

Density of water

A

1000 kg/m^3

28
Q

In an enclosed structure, fluid force is the same everywhere. This gives rise to the formula

A

A1d1 = A2d2

29
Q

Formula for a Hydraulic Jack

A

(F1/A1) / (F2/A2)

30
Q

Laminar Flow

A

Straight line flow of lines that don’t interact. Once the speed picks up you reach a point of change into turbulent flow where uniformity breaks down.

31
Q

Turbulent flow

A

Usually we aim to avoid this kind of flow since it lacks uniformity.

32
Q

Flow rate formula

A

A1v1 = A2v2

33
Q

Within a system the flow rate is always

A

Constant

34
Q

Bernoulli’s equation

A

P1+1/2ρv1^2+ρgh1=P2+1/2ρv2^2+ρgh2