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TESTING INVESTIGATION: COEFFICIENT OF KINETIC FRICTION
GIVEN: Assemble a modified Atwood’s machine as shown on the diagram.
The mass of block and the mass of hanger are given.
You may only use a meterstick.
Constraint: distance d > h
TASK: Estimate the coefficient of kinetic friction between the block and the surface.
POSTER: Multiple representations should include: energy bar chart(s) and complete derivation of the equation to determine the coefficient of kinetic friction.
EXTENSION: How can you determine the validity of your answer?
Describe a second experiment that could be performed to determine the coefficient of kinetic friction. There are no restrictions regarding equipment. Include all the details of the experimental procedure, measurements to be taken, equations that are needed, and calculations to be performed.
1. Perform the experiment
2. Calculate the percent difference
3. Discuss sources of experimental error for both investigations.
AP PHYSICS 1
Essential Knowledge 5.B.5: Energy can be transferred by an external force exerted on an object or system that moves the object or system through a distance; this energy transfer is called work.
- LO 5.B.5.1: The student is able to design an experiment and analyze data to examine how a force exerted on an object or system does work on the object or system as it moves through a distance. [SP 4.2, 5.1]
- LO 5.B.5.3: The student is able to predict and calculate from graphical data the energy transfer to or work done on an object or system from information about a force exerted on the object or system through a distance. [SP 1.4, 2.2, 6.4]
- LO 5.B.5.4: The student is able to make claims about the interaction between a system and its environment in which the environment exerts a force on the system, thus doing work on the system and changing the energy of the system (kinetic energy plus potential energy). [SP 6.4, 7.2]
- LO 5.B.5.5: The student is able to predict and calculate the energy transfer to (i.e., the work done on) an object or system from information about a force exerted on the object or system through a distance. [SP 2.2, 6.4]
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