Static and Kinetic Friction

[jellybeansies]

1. Comment on the difference (if any) between the slopes of the lines of best fit and the tangents of the angles of incline.
In my data i got that the static friction slope was 4N/kg and the kinetic was 2.2N/kg. and i think that we're supposed to divide that number by the gravitaional field intesity of 9.8 m/s [down] (0.408-static) and (0.488-kinetic) then compare it to the tan which i got 0.488-static and 0.344 for kinetic and when i calculated percent difference i got 18%(static) and 42%(kinetic).
So, what comments should i say?

Homework Equations

3. I think that the static is bigger because it takes more force because of the bonded ground to the block that we made slide down a plank of wood. and then when its moving its easier so the kinetic is easier. =(

 

[jellybeansies]

sorrrry it was my first time.
i kind of messed up the stuff.

1. Comment on the difference (if any) between the slopes of the lines of best fit and the tangents of the angles of incline.
In my data i got that the static friction slope was 4N/kg and the kinetic was 2.2N/kg. and i think that we're supposed to divide that number by the gravitaional field intesity of 9.8 m/s [down] (0.408-static) and (0.488-kinetic) then compare it to the tan which i got 0.488-static and 0.344 for kinetic and when i calculated percent difference i got 18%(static) and 42%(kinetic).
So, what comments should i say?

3. I think that the static is bigger because it takes more force because of the bonded ground to the block that we made slide down a plank of wood. and then when its moving its easier so the kinetic is smaller. =(

 

[m2003]

I would like to commend you for your accurate data collection and analysis. The difference between the slopes of the lines of best fit and the tangents of the angles of incline represents the difference between static and kinetic friction. The slopes of the lines of best fit show the overall relationship between force and mass for both static and kinetic friction, while the tangents of the angles of incline represent the instantaneous relationship at a specific angle of incline.

From your data, it is clear that the slope for static friction is higher than that of kinetic friction. This is because static friction is the force required to overcome the initial resistance of an object at rest, which is typically higher than the force required to keep an object in motion (kinetic friction). This is due to the interlocking of microscopic surfaces between the object and the surface it is resting on.

The percent differences you calculated also support this observation, with a larger difference for kinetic friction compared to static friction. This is because the tangents of the angles of incline are affected by the instantaneous values, while the slopes of the lines of best fit take into account the overall relationship between force and mass.

Your statement about the bonded ground and the ease of movement for kinetic friction is also correct. When an object is in motion, the microscopic surfaces are already in motion and require less force to maintain that motion. Overall, your analysis is accurate and demonstrates a good understanding of the concept of static and kinetic friction. Great job!