Coefficient of Friction

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Presentation transcript:

Coefficient of Friction Setting up and executing an experiment.

QPOE2 What do you know about the given question How will you apply what you found Question Application Knowledge probe Explanation Evaluate Prediction Data Analysis Investigation plan Observation How will you analyze your data How will you investigate the question

QUESTION Which of the following objects has the greatest coefficient of rolling friction between itself and the carpet floor?

What have we learned that would help us answer this question What have we learned that would help us answer this question? The coefficient of static and sliding friction activity showed us that we can calculate m by dividing the friction force by the normal force (mass x acceleration due to gravity).

When an object is rolling, the only force on the object is the friction force between the object and its surface of contact. This means that the net Force is equal to the friction force. Newton’s 2nd Law of Motion Friction force equation So to calculate the coefficient of rolling friction, take the acceleration of the rolling object and divide by acceleration due to gravity

Equations of Motion for Uniform Acceleration Equations Variables vf = vi + at vi vf a t d = ½ (vf + vi) t vi vf d t d = vit + ½ at2 vi a d t vf 2 = vi 2 + 2ad vi vf a d

Knowledge Probe What do we know about friction? How do we calculate the coefficient of friction? Which kinematic equations would help us? What materials do we need? What values are we going to measure? What types of errors should will we encounter? How many measurement should we take?

PREDICTION Which object would have the greatest coefficient of rolling friction between itself and the carpet floor? 1st hour prediction: tennis ball, racquetball, steel ball Why? Justify your prediction. tennis ball – because of the fuzziness of the ball - because it is lighter racquetball – the surface texture steel – because it is heavy

Investigative plan Determine the procedures with which we can obtain the values needed in the knowledge probe which in turn will answer the QUESTION. Material list: ball, ramp, stopwatch, meter stick, carpeted area, pencil and paper, calculator Procedure: 1. Gather the materials. 2. Set up 20-cm high ramp and lay out two meter-sticks 3. Release the object and start the timer when the object is at the end of the ramp. 4. Stop the stopwatch when the ball stop moving. 5. Measure the distance from the end of the ramp to where the ball stopped. 6. Record the data into the tables. 7. Repeat the process 5 times for three different objects 8.

OBSERVATION What values are measured? How many times do we repeat the trials? Object: Tennis Ball displacement time Trial 1 Trial 2 Trial 3 Trial 4 Trial 5

Data analysis What information can be derived from the observation? Object: Tennis Ball displacement time Initial velocity acceleration Trial 1 Trial 2 Trial 3 Trial 4

EVALUATION Using the acceleration that was calculated rom the data analysis, determine the coefficient of friction. Object: Tennis Ball displacement time Initial velocity acceleration Coefficient m Trial 1 Trial 2 Trial 3 Trial 4

EXPLANATION From the evaluation, ______________ has the greatest rolling coefficient of friction. Offer reasons why the object has the greatest rolling friction. 1. 2. 3. 4.