Solving Frictional Force: Find Ff & Kinetic Friction Coefficient

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Ff will be equal to the applied force subtracted by the net force. The correct solution is to use F=ma to find the net force and then subtract it from the applied force to find Ff. The textbook may have used a different approach, but the end result should be the same. In summary, the problem involves finding the frictional force (Ff) and coefficient of kinetic friction (μk) given an applied force (F) and acceleration (a). The correct solution is to use F=ma to find the net force and then subtract it from the applied force to find Ff. The textbook may have used a different approach, but the end result should be the same.
  • #1
pinkyjoshi65
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[SOLVED] URGENT---Frictional force

A force of 1.6N is applied to a box of mass 1.8Kg. It accelerates 0.6m/s^2. Determine Ff and the coefficient of kientic friction.

K so I knoe how to do this. But in the textbook, it has been done in a different way.

So what I did is Found the net force using F=ma.
Then i subtract from 1.6 and get Ff.
Then use the formula mk= Ff/Fn

In the book they took Ff=ma
Which is the right solution?
 
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  • #2
Well [itex]F_{net}=F_{applied}-F_k [/itex] where [itex] F_k[/itex] is the force due to kinetic friction. So with a bit of manipulating one can see that the friction force will be the applied force minus the net force which can be worked out from the acceleration of the block.
 
  • #3
And fnet is MA
 
  • #4
pinkyjoshi65 said:
And fnet is MA

Yes.
 

1. How do you calculate the frictional force (Ff) in a given scenario?

To calculate the frictional force, you will need to know the normal force (Fn) and the coefficient of kinetic friction (μk). The formula for frictional force is Ff = μk * Fn.

2. What is the coefficient of kinetic friction (μk)?

The coefficient of kinetic friction is a measure of the amount of friction between two surfaces in motion. It is a unitless constant that is unique to each specific material pairing.

3. How do you find the kinetic friction coefficient for a specific material pairing?

The kinetic friction coefficient can be found through experimentation and testing. By measuring the force required to move an object across a surface at a constant speed, and dividing that by the normal force, you can calculate the coefficient of kinetic friction.

4. What factors can affect the coefficient of kinetic friction?

The coefficient of kinetic friction can be affected by a variety of factors, including the surface texture and roughness, the weight of the objects in contact, and any lubricants or other substances present. Temperature can also play a role in changing the coefficient of kinetic friction.

5. How can you reduce the frictional force in a given scenario?

There are several ways to reduce the frictional force in a given scenario. One way is to use lubricants, such as oil or grease, to create a smoother surface between the two objects in contact. Another way is to decrease the weight of the objects in contact, as friction is directly proportional to the normal force. Additionally, choosing materials with lower coefficients of kinetic friction can also reduce the frictional force.

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