The Coefficient of Kinetic Friction Objective: To determine the coefficient of kinetic friction between two selected surfaces by using a horizontal surface Equipment: A computer with internet connection, a calculator The built-in calculator of the computer may be used. Consider the following two Figures.
The video discusses how different surfaces create different amounts of friction. We will be testing different surfaces in our experiment today so this video leads into the lesson nicely.
After watching the video. I tell students that we will be testing how different surfaces affect the motion of a toy car today.
In the video they test concrete, grass, and carpet. We will be testing wood, cardboard, burlap, and carpet. Guided Practice 20 minutes Experiment Set Up in Notebooks Students take out their science notebooks and glue in a prefolded, trifold paper I pass out.
I place my science notebook on the overhead to use as a visual for students. Having the visual up for students to use helps the ESE and ELL students as well as those students who struggle with writing and spelling.
Having these steps available allows them to focus on the discussion taking place and not just on copying information down. I have the other students write the steps because they are quicker at writing and by hearing it, reading it, and writing it, it may help Friction experiment design and results retain the information more easily.
The steps that are provided to the ESE students have been cut out so that they still have to read the information, decide where it belongs, and glue it in the correct location. This allows them to hear the information and read the information.
We record the question: Which surface creates the greatest amount of friction?
I show students the wood, cardboard, burlap, and carpet surfaces that they will be testing. I allow students to feel the surfaces and discuss the differences with their group.
In order to make a hypothesis, students will need to use their observations to determine which they believe will produce the most friction.
After feeling each of the surfaces, I begin the hypothesis as: I instruct students to complete the sentence with what type of surface they believe will produce the most friction. Before recording their hypothesis, I ask what will happen with the surface that produces the most friction.
Students tell me that the car will not travel very far. I do this as a review of what we learned about friction in the Types of Forces lesson at the beginning of the unit, as well as knowledge they should have obtained from the video.
We record the materials that are needed for the experiment: The ESE students already have this with their other steps, but I provide it to everyone else as a way to save time. There are several steps in the experiment which would take an extended amount of time to copy.
As I read through the steps, we discuss the forces acting on the car. When the car is placed at the top of the ramp, gravity is the only force that should act on the car.
I point out that no students should be applying a force by pushing the car. I ask students what force acts against gravity as the car rolls down the ramp. They tell me friction. I explain that as we test each surface, we will see if any of the surfaces produce enough friction to overcome the force of gravity and stop the car before it moves down the ramp.
The final step in setting up the experiment is to create a data chart. The data chart goes in the middle of the foldable. It is made up of 4 columns, one for each trial, and the headings. There are 5 rows, one for each surface and the last for headings.
On the front cover of the experiment foldable, we record the following information and discuss. Independent Variable - type of surface Dependent variable - distance traveled I stress that we are measuring the distance traveled, not the speed of the car Control Variables - height of ramp, length of ramp, car used, how you measure from front of car or backforce used to move the car.Pipe Friction Lab Report.
Mohammed Atheeq Nasir and the walls of a pipe and the energy loss associated with it has numerous engineering applications in industry The results of this experiment could be used in the oil pipe system design and pump design industries where knowledge of different magnitudes of pressure drop for different types of /5(6).
Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives. Jun 08, · When the applied force, F, is increased further (beyond the limiting frictional force), the body begins to move, then the force opposing the motion is called the kinetic or sliding friction.
Friction, Experiment and Theory The experimental design for the first part of the lab will be very similar to what Using the same blocks as before, compare your results with those determined in Step 1. Figure 1. Finding the angle of repose.
3. Select a block and . Keywords: experimental results, friction coefficient, friction rig design, sliding velocities. 1 Introduction Friction is important in everyday life and it forms the basis of many a moving or stationary product.
Newton's 3rd Law and the Friction Force Physics Electricity and Magnetism Instructor: Professor Andrew Boudreaux, [email protected] Design and conduct experiments in order to explore the questions below.
describe your experiment and the results. • Is the equality preserved when the masses of the carts are no longer equal.