Purpose The purpose of this experiment is to test Coulomb's Law which states that the force between two spherically symmetric charged objects is directly proportional to the product of the charges, and inversely proportional to the square of the distance between the centers of the two charges. In mathematical vector notation Coulomb’s Law is expressed as
where Fr is the force on particle 1 due to particle 2 in Newtons, q is the charge on 12 1 particle 1 in Coulombs, q2 is the charge on particle 2 in Coulombs, rˆ12 is a unit vector originating at the center of particle 1 and pointing directly away from particle 2, r is the distance between the centers of the two particles in meters, and k is a constant, given by
Introduction Coulomb
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Calculations To determine if Fc is inversely proportional to r2, we calculated Fc and 1/r2. Several other calculations were made before we were able to arrive at these values. In table 1, columns 1 and 2 are data. Columns 3 and 4 are the coordinates of the ball and prod in meters. The conversion was made using the following equation. xm = (xp - 109.2)/.1112 where xm is the coordinate in meters, and xp is the coordinate in pixels. This equation was found by graphing pixels vs. meters for known values along a meter stick. The graph was linear with an R 2 value of 1.000, and the equation of the least squares fit line was used to convert from pixels to meters. The distance between the prod and the ball, r, is the difference in the two coordinates; r = xp - xb where xp is the x coordinate of the prod and xb is the x coordinate of the ball. Column 7, 1/r2 was computed from r. The distance from equilibrium, x, was calculated using x = xe – xb where xe is the coordinate of equilibrium. The magnitude of the repulsive force, F c, is found using the equation derived earlier, adding the mass of the string to the mass of the ball. Results: If Fc is inversely proportional to r2, then a graph of Fc vs. r should yield an inverse square relationship. A data summary is shown in Table 1 below.
Table 1: Summary of Coulomb Data
As shown in Figure 4, when the video analysis is done carefully and modeled with Fc = Const./r 2 ,
* Protons and electrons have equal and opposite electrical charges. Protons are positively charged, and electrons are negatively charged.
Objective: Using a marble launcher, launch marbles from different angles with different forces to find the maximum height and the velocity as it leaves the launcher. Using different variables and results to determine how the different angles and amounts of force effect the variables. With this data show the effect the forces cause in 1-D and 2-D motion, as well as in the X and Y directions. This is done through kinematic equations and calculations.
This soccer science fair project serves to acquaint students with basic information on how the amount of air in a soccer ball can affect the distance it travels when kicked with a consistent force. The greater the air pressure in the ball, the farther it will travel when a force is applied. In the process of conducting the research, the student will learn that atmospheric pressure may also affect how far the ball will travel. The student will learn about the relationship between air pressure and friction: the lower the friction, the farther the ball will go. The student will learn about concepts like air pressure, gravitational force, compression and expansion of air molecules, potential energy and kinetic energy. This science fair experiment
One of these properties is called an electrical charge. Protons have a "positive" (+) charge, electrons have a "negative" (-) charge, and neutrons have no charge, they are neutral.
In this model, T2 is the orbital period squared, M is the mass ratio, L is the length of the string and g represents the acceleration due to gravity.
Snow globes are made of clear glass, a transparent sphere with a scenic view and a plastic toy inside the globe. The globe must be shaken to actuate the snow so the white particles can fall gradually to reach the base. When the marble (object used for this experiment) falls, it experiences two external forces which are; the gravitational force and the aerodynamic (fluid resistance) drag of the marble, which affects the rate of the marble. As the marble is falling, the speed is increased due to the gravitational force, which is pulling the marble downwards to the base of the beaker until it reaches the terminal velocity, where both external forces are equal. However, there are factors that can affect the marble’s terminal velocity, such as
First, we will set up the force table. The table comes in three separate pieces the base, stand and table once we connect and fasten all three parts we must use a circular level to make sure the table is balanced. If the force table isn’t balanced then we must adjust the base’s feet to the appropriate levels on each leg till the bubble on the level is centered. We must then assign where the positive & negative x, y axis are on the force table as a point of reference and label them with tape .Then for part I we must apply 1.96 N in the positive x – direction, and 2.94 N in the positive y-direction then we must balance the two with a third force and record the magnitude and direction of it and a draw a diagram showing all three forces. Part II
To investigate and observe how the acceleration of a mass depends on the resultant forces acting on it, along with its mass, and to furthermore define the relationship between acceleration, net force, and mass as a single equation.
20. Because the magnetic force which deflects the electrons is defined by F = q * v x B
6) Now click on ‘Circular’ on the bottom. Describe the motion of the ball and the behavior of the two vectors. Is there a force on the ball? How can you tell? Be detailed in your explanations.
In the first experiment, “ How does mass affect your game?” it shows that the data on “Ball- Mass 3” that the 10 pound bowling ball had the highest kinetic energy of 27(J), the greatest velocity (m/s) of 3.42, and in average it produced 4 bowling points. According to the data, on “ Ball- Mass 1” the 11 pound ball got an average velocity (m/s) of 3.14, the kinetic energy of 24 (J), and the average bowling points of 3. On the other hand, the evidence shows that the 12 pound bowling ball in “ Ball- Mass 2” has the velocity (m/s) of 3.12, the kinetic energy of 23 (J), and the average bowling points of 4 . Concluding that in my Game 1 the velocity of the masses of the bowling balls decreased when the bowling balls were heavier and that the kinetic energy was lower as the mass increased in the bowling balls.
From the FBD, the charge 1 is at rest and have a net force of 0.
2. No, the forces went in equal and opposite directions just as the rubber band and string
The forces that are involve with the experiments are basically focused on the concurrent forces. The experiment also allows us to develop the condition of balancing or arranging the angles both sides on a force table. This laboratory experiment allows us to take the mathematical abstraction of a vector to make it tangible as possible. This experiment will look into two ways of
1. Electric charges attract or repel one another with a force inversely proportional to the square of the distance between them: unlike charges attract, like ones repel.