# Friction experiment design and results

Contact Author What surfaces create the most friction? Friction is something we experience everyday, but understanding it, let alone explaining it, gets tricky. These experiments will help teach the concept of friction and make it easier for kids to understand. Test which surfaces create more friction, see how strong friction is, learn how to reduce friction, and even discover the side effects of friction. Scott Hildreth Part A: The rotational inertia experiment uses a drum wrapped with string, which will be pulled by a descending mass to create a torque that turns the drum.

Measure the diameter of the drum of the rotating support and record along with your uncertainty! Determine the masses of the accessories: Record these with your uncertainties.

How will this process affect your uncertainty in measurement of the masses? How many significant figures are reasonable? What are the percentage uncertainties in your measurements? Using the pulley arrangement, add a small amount of mass to the descending side so that the drum begins to turn at a constant rate.

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You might assess whether the drum is turning by looking at the descending mass — it should move at constant speed linearly if the drum support is rotating at constant angular speed. Record this mass mo— it establishes the frictional resistance of the drum and pulley, and will have to be subtracted from other measured descending masses in the experiment to determine actual torques.

Attach a g weight hanger to the string, and add the frictional mass mo to the hanger. Measure the distance y from the floor to the bottom of the hanger, release the weight, and record the time t required for the hanger to hit the floor.

Be sure to include your uncertainties in distance and time, and determine your percentage uncertainties in both measured quantities. Do three trials for descent, and determine the average time required.

Students act as scientists to conduct an experiment to test if wood, cardboard, burlap, or carpet produce the greatest amount of friction for a toy car. Plan your minute lesson in Science or Gravitational Force with helpful tips from Jennifer Sallas. In this experiment, you had to keep tipping the book until the force of gravity became stronger than the friction force. Both forces depend on the angle of the book. As long as the friction force is larger, the objects won’t move. Experiment 5 ~ Friction Purpose: In this lab, you will make some basic measurements of friction. First you will measure the coefficients of static friction between several combinations of surfaces using a heavy block and a set of hanging masses.

Since you know distance, initial velocity zero! You can also determine its average linear acceleration and angular acceleration from the equations of motion! Experiment a Now place the flat disk accessory on the rotating support, add more mass to the hanger so that it descends with constant speed record this value as mo.

Why would this be more than the previous value of mo from the support alone? Now add extra mass so that the hanger descends slowly to the floor.

Record the distance fallen and time taken for 3 trials. Repeat with the hoop, and then Experiment c:Introduction.

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Friction is a force between objects that opposes the relative motion of the objects. In this project, you will be studying kinetic friction (also called sliding friction).When two objects are moving relative to one another, kinetic friction converts some of the kinetic energy of that motion into heat.

In this experiment, we examined kinetic friction. We performed two tests to see which physical properties affect kinetic friction.

## Understanding Design of Experiments | Quality Digest

In the first part of the experiment, we determined if the Results We started the lab by measuring the mass of the objects. I have listed the masses of the. Use your data from Data Table 2 and graph the Static friction and Sliding friction forces.

Calculate the slope or use Logger Pro. Find the coefficients of static and sliding friction . the Experiment/Setup sensors/LabPro1 menu and choose the port which force Experiment 6 The Coefficient of Friction speed. You should have to tap the block Were your results as expected. Explain. 3. Why was it necessary to tap the block to get it started in section 11 of the lab? 4. Why can anti-lock brakes stop a car in. The pulleys don't need to move for this experiment. If we take ideal pulleys (that is with zero friction) then the extra tension due to friction would disappear and we would get the most accurate result.

There is a big difference. Experimental results are derived from actual laboratory experiments on the system under study. Theoretical “results" are just someone's application of the latest theory to that system to try to predict how it works in reality, without actually doing anything.

Factors Affecting Friction | Science project | schwenkreis.com