data analysis into excel, what graph are you creating and how is it giving you the data you need?
make position vs. time graph and get slope for terminal velocity?
polish the word document that you have for the experiment.
one thing: elaborate on procedure and why you are running the details (e.g. where to drop the object) the way you are.
show me the equations and your prediction for the terminal velocity in the fluid today.
then we need to determine the prediction
hypothesis (state here): If a ball with known properties (mass,volume) is dropped through a liquid, then the coefficient of viscosity of the liquid can be determined.
independent & dependent variables (clearly indicate): independent: type of liquid; dependent: coefficient of viscosity of liquid
Natland Note (2/07/13): A couple things:
One, that team name is still a bit inapprop's....give me something a bit tamer....until then....well you see it
Project 1 - this one seems okay & ready to go. instead of just using a meter stick, I think you will want to create a kind of large "grid paper" on the ground and have the collision take place on top of it. You will want the grid to have somewhat thin - but noticeable - black lines. Where do you want to get this paper? please write it under materials below. Is this your #1 project or do you like the next one better? Also, let me know Friday (2/08)
Project 2 - I think you changed this one to measuring fluid drag, no? Check out this link: "http://hyperphysics.phy-astr.gsu.edu/hbase/lindrg.html"; it has good stuff. you want the viscous drag equation and need to look into how to get/measure the various values in the equation. You will also need to take into account the buoyant force so you will need find the density of the liquid you use with a pre-experiment. This one could definitely be interesting.Your procedure seems good, but what do you want to measure if you use a marble? Do you want to measure the viscosity? If so, ideally you want to try and compare it to a "known" value.
This is also very good: http://physics.info/viscosity/. It has a table of viscosities and describes viscosity in more detail for your understanding so you all can better discuss it/explain it/write about it in your paper (you will probably want to cite this). When it comes to materials, it seems water, rubbing alcohol, and/or vegetable oil could be good substances. look tomorrow (2/08) and let me know if we have the proper graduated cylinder for this (it needs to be tall to get some good data) up in the chemistry department...if we do, get one (ask the teacher to borrow it if one is there).
Glancing Collisions between two pool balls, two lacrosse balls, and two tennis balls 250 fps
Questions and Objectives
How well is momentum transferred between objects of a certain material?
How much do each of the materials deform on impact?
Materials
Meter stick(s)
Simple straight “V” ramp (I can make one)
Tennis ball x2
Pool ball x2
Lacrosse ball x2
High-speed camera
Scale
Procedure
Set up ramp and measuring devices in the gym.
Place one pool ball at rest near the end of the ramp at a certain distance away from the trajectory of the ramp
Set up high speed camera to be able to observe both the collision and meter stick
Release the other pool ball from the top of the ramp and capture collision with the high speed camera
Use the physics of momentum conservation in order to calculate how well momentum was transferred through the collision
Repeat steps 2-5 using lacrosse balls
Repeat steps 2-5 using tennis balls
Project 2
Measure the dynamic viscosity of a liquid by analyzing the motion of an object through that liquid
Dynamic viscosity is a liquid's resistance to an applied force (inertia!). Density is the mass per unit of volume of a substance. There is no mathematical relationship between dynamic viscosity and density. We want to measure the dynamic viscosity of a liquid by analyzing the motion of an object through it. Video analsis would allow us to find the net acceleration and terminal velocity of the object in its motion. Using forces and known equations for the bouyant force and drag due to viscosity, we can calculate the coeficient of viscosity for different liquids.
Material
Small metal ball/marble
Tall Graduated Cylinder (300mL+)
Rubbing alcohol
Syrup
Oil (vegetable or canola)
Water
Triple Beam Balance
Meterstick/ruler
Procedure
Weigh the graduated cylinder. Add one of the liquids and take note of the volume. Record the difference in mass and divide by the volume to calculate the density of the liquid. (Still unsure about dynamic viscosity)
Measure the length of the graduated cylinder from the meniscus to the bottom and set up the meter stick next to the graduated cylinder.
Place the camera next to the cylinder so the view is from the side and the entire cylinder can be seen.
Hold the marble right above the surface of the liquid so as to insure it does not have an initial velocity when it hits the surface. Release the marble and record the motion of the marble.
Right now, I'm trying to find a relationship between Force, area, velocity, volume, and dynamic viscosity. The units for dynamic viscosity are Pa(s) (Pascal x seconds) and shearing stress is in units of Pascals. In order for us to be able to measure the dynamic viscosity, we need a relationship between dynamic viscosity and values that we can measure. It is possible for us to measure force, area, volume, and velocity using the high speed camera and a few basic instruments.
Calculating the dynamic viscosity of the liquid by dropping an object from rest through the liquid. Using video analysis, we measure how long it takes for the object to reach the bottom and with kinematics, we can calculate the net accelaration using the time and change in x. Using F=ma, we would be able to find the net force on the liquid with the calcualted acceleration. Given this net acceleration, we can compare the expected motion of the object with the actual motion of the object.
Team Members: Sebi, Clara, and Jimmy
Natland Note (4/15/13):
Natland Note (2/07/13): A couple things:
Team Name: The Harlem Shakers
google docs link: https://docs.google.com/document/d/1ksBx2xzi25e6Dg2zO7LpIQuIWnTicmBARVSIbn-izpo/edit?usp=sharing
Lab Setup link: https://docs.google.com/file/d/0B07IVE4LQll5Y09SV1dyemMzMXM/edit?usp=sharing
1) List the 3-5 ideas you had (as bullet points) for the slow-motion camera, and what frame rate you in mind for eacm (e.g. 100fps):
To Do List
New Project
Project 1
Glancing Collisions between two pool balls, two lacrosse balls, and two tennis balls 250 fpsQuestions and Objectives
Materials
Procedure
Project 2
Measure the dynamic viscosity of a liquid by analyzing the motion of an object through that liquidDynamic viscosity is a liquid's resistance to an applied force (inertia!). Density is the mass per unit of volume of a substance. There is no mathematical relationship between dynamic viscosity and density. We want to measure the dynamic viscosity of a liquid by analyzing the motion of an object through it. Video analsis would allow us to find the net acceleration and terminal velocity of the object in its motion. Using forces and known equations for the bouyant force and drag due to viscosity, we can calculate the coeficient of viscosity for different liquids.
Material
Procedure
http://www.saylor.org/site/wp-content/uploads/2011/04/Viscosity.pdf
Right now, I'm trying to find a relationship between Force, area, velocity, volume, and dynamic viscosity. The units for dynamic viscosity are Pa(s) (Pascal x seconds) and shearing stress is in units of Pascals. In order for us to be able to measure the dynamic viscosity, we need a relationship between dynamic viscosity and values that we can measure. It is possible for us to measure force, area, volume, and velocity using the high speed camera and a few basic instruments.
Calculating the dynamic viscosity of the liquid by dropping an object from rest through the liquid. Using video analysis, we measure how long it takes for the object to reach the bottom and with kinematics, we can calculate the net accelaration using the time and change in x. Using F=ma, we would be able to find the net force on the liquid with the calcualted acceleration. Given this net acceleration, we can compare the expected motion of the object with the actual motion of the object.
RESOURCES