Physics 2 “Work”

Universidad Autónoma de Nuevo León [pic 1][pic 2]

Centro de Investigación y Desarrollo de Educación Bilingüe

Physics 2

“Work”

Lab Report #3

Group

Mr. Marco Antonio Arellano

• Practice Objective

To calculate work, experimentally, done by a constant force in magnitude, direction, and sense.

• Introduction 

In physics, a force is said to do work if, when acting there is a displacement of the point of application in the direction of the force. For example, when a ball is held above the ground and then dropped, the work done on the ball as it falls is equal to the weight of the ball (a force) multiplied by the distance to the ground (a displacement).

• Materials

• 1 Linear Air track system
• 1 Air pump
• 1 Digital Stopwatch
• 1 Pulley and pulley mounting clamp
• 1 Ruler
• 1 Glider with holder with timer flag
• 1 Magnet
• 2 Photocell
• Set of weight
• Set of holding magnets
• Piece of thread

• Procedure

1. Set up the linear air track system and verify the level.
2. Mount the pulley and center it at the same level as the hole in the equipment, attach the weight to the thread to hold the glider with the timing flag.
3. Set up the photocell over the metallic ruler and connect them to the digital stopwatch, in a way that the photocell that is closer to the glider must record the time interval recorded by the stopwatch.
4. Turn the air pump and the stopwatch on, and adequate them to the appropriate time scale.
5. Place the glider with the timing flag centered on the photocell and the stopwatch stopped.
6. Release the glider. The stopwatch starts when the timing flag glider passes in front of the first photocell and ends when passes in front of the second photocell.
7. Measure the glider mass, mass hanger mass and weights. The distance between photocells should be 80 cm. Repeat two more times in order to obtain an average time.

• Observation

There were some trouble while in the making of this lab practice because first we had to cancel the first value the stopwatch gave us because it was a lot of difference in the next quantities, and that would give us different results than the real ones, the error range would be greater so we had to cancel one value. Then after we were done doing the practice, we realized we had been making bad the calculus since we had a different mass than we were told, so we also had to change the mass and start the calculus all over again.

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