17-April-2017: lab 13-Magnetic Potential Energy Lab

Lab Partners: Lynel Ornedo, Nina Song, and Joel Cook

Purpose:

Determine an equation for the magnetic potential energy with a magnet in conjunction with a slider on an air track.

Setup:

In this experiment we use an air track attached to a reverse vacuum which will create an air flow and make the metal slider on the track able to travel without friction. This equipment will reduce error. A strong magnet is attached to the slider and another strong magnet will be attached to the end of the track.

Procedure:

When we move the metal slider to the end, the slider will bounce back due to the magnetic force. So if we level the air track at different angle we can get a table which includes angle, force and radian.

As we all known, the integration for a force equals to energy. In this lab, the integration of F is the magnetic potential energy.

To verify this equation, we need to use a motion sensor. Attach this motion sensor to the end of the magnetic side. Because of the distance between motion detector and the magnet as plotted below, we need to derive the new distance.

So first we need to level the track again and make sure that it is horizontal, which means the cart will not move unless we give it a push. Then we give the cart a push and record on logger pro. We can derive the plot of position verse time. With it we can derive the speed and then the kinetic energy. Use logger pro we can derive the various energies verse position and time as plotted below.

Conclusion:

We can find that the total energy for the whole system is almost a constant about 0.009J. There may be some error caused by fail to level the track or very small friction, which make the total energy look like a wave. Another reason is that we chose a quiet large value for the distance between points in the plot, which is also a reason for the oscillation of the total energy.

Comments

Lab 19: PHYS 4A Lab--Conservation of Energy/Conservation of angular momentum

lab 6- Propagated Uncertainty in Measurements

Propagated Uncertainty in Measurements Purpose Learn how to calculate propagated uncertainty in density measurements with different metal material cylinders. Process First, we need to measure the density of two cylinders made of different materials . To measure the density we should measure its mass m, diameter d and height h. Mass(g) Diameter(cm) Height(cm) 69.4 1.55 5.01 27.6 1.59 4.98 So the density of the first material is about 7.31 g/cm^3, which may be zine. The density of the second material is about 2.80 g/cm^3, which may be aluminum. Then we should calculate the propagated uncertainty of the density. For a cylinder, its density can be calculate with the equation p=(4/∏)* [m/(d2*h)]. The differential form of this equation is dp= (∂p/∂m)*dm + (∂p/∂d)*dd + (∂p/∂h)dh, which equals to The calculation is attached below. Conclusion In this lab, we learnt ho...

Lab 22 Physical Pendulum Lab

Lab 20 Purpose: Predict an expression for the period of various physical pendulums. Verify the predicted value with the value getting from experiment. Learn to find out a physical pendulum’s period by calculating and by Logger Pro and video camera. Theory: In the first part, we need to get the center of mass of different shapes so that we can determine the momentum of inertia of them at the center of mass. By parallel axis theorem, we can derive the momentum of inertia of them at required center. Use the T=I α where α=ω^2*Θ to get the ω . And 2 π / ω is the result we want. We assume the parameter B as the base and H as height for an isosceles-triangle. When it comes to the semicircle, we use R stands for the radius of the semicircle. The result of each physical pendulums is followed. We will use Logger Pro for the experiment part to determine the period in the videos. ...

Phys4AS17 jsong

Search This Blog