Help for lab (kinetic friction)

In summary, to calculate the coefficient of kinetic friction for your lab on friction, you will need to use the given time, displacement, height, and length to find the normal force, and then use that and the calculated friction to solve for the coefficient of kinetic friction. Remember to use the correct equations and units for your calculations.
  • #1
hfz_105
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1. I have a lab on friction I did in class, I have missed couple of days and and its due today, what i need to know is how can i calculate the friction of the object if I have the following given , the time it took for the object to come down the raamp, the displacement , the height of the inclined surface and length.

Note I want to know the coefficient kinetic friction, not static.( i know how i can get that)



3. I have the calculated velocity and acceleration :S


Thanks for the help

I have added a picture of exactly what the lab looked like.

2mcuhpg.jpg
 
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  • #2
To calculate the coefficient of kinetic friction, you need to use the equation: Friction = μ * NWhere μ is the coefficient of kinetic friction and N is the normal force. The normal force can be found using the equation: N = m * g * sin(theta)Where m is the mass, g is the acceleration due to gravity, and theta is the angle of the incline. Once you have the normal force, you can then use the equation: μ = Friction / N To find the coefficient of kinetic friction.
 

FAQ: Help for lab (kinetic friction)

1. What is kinetic friction?

Kinetic friction is the force that opposes the movement of two surfaces that are in contact with each other. It is caused by the microscopic irregularities on the surface of the objects that come into contact, which create resistance and cause the objects to slide past each other.

2. How is kinetic friction different from static friction?

Kinetic friction occurs when two surfaces are already in motion relative to each other, while static friction occurs when two surfaces are at rest relative to each other. Kinetic friction is usually lower than static friction, as it takes less force to keep an object in motion than to start it in motion.

3. What factors affect the magnitude of kinetic friction?

The magnitude of kinetic friction is affected by the types of materials in contact, the roughness of the surfaces, and the force pressing the two surfaces together. It is also affected by the speed of the objects in motion, as higher speeds can lead to more heat and wear on the surfaces, increasing the friction.

4. How is kinetic friction measured in a lab setting?

Kinetic friction can be measured using a device called a dynamometer or by using a force sensor and a motion detector. The force needed to keep an object moving at a constant speed is measured, and this force is equal to the kinetic friction between the two surfaces in contact.

5. How can we reduce the effects of kinetic friction?

To reduce the effects of kinetic friction, you can use lubricants such as oil or grease on the surfaces in contact. These substances can fill in the microscopic irregularities and reduce the resistance between the surfaces. You can also use smoother surfaces or reduce the force pressing the surfaces together to decrease the magnitude of kinetic friction.

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