Frictional Force: Comparing Forces

In summary, when pushing a chair across a carpet at a constant velocity, the force exerted on the chair is equal and opposite to the force of friction. However, if the force is increased, the frictional force will also increase, causing the object to accelerate due to the net force.
  • #1
krackers
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0

Homework Statement



If you push a chair across a carpet at a constant velocity of 0.5 m/s, how does the force you are exerting on that chair compare with the force the force of friction? If you increase the force you are exerting, how does the new frictional force compare with the previous frictional force?

2. The attempt at a solution

Part I. Since there is a constant velocity there should be no acceleration. This means that the net force must be 0. Since there is clearly force applied in one direction, the frictional force oppose the applied force equally, so the frictional force is to the force that you apply to the chair.

Part 2. However, let's say you increase the force applied. Since the coefficient of kinetic friction is a constant, and since you were previously providing just enough force to balance the kinetic frictional force, and the force applied will be greater than the kinetic frictional force. Thus, due to the net force, the object will accelerate.

Is my reasoning correct?
 
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  • #2
krackers said:

Homework Statement



If you push a chair across a carpet at a constant velocity of 0.5 m/s, how does the force you are exerting on that chair compare with the force the force of friction? If you increase the force you are exerting, how does the new frictional force compare with the previous frictional force?

2. The attempt at a solution

Part I. Since there is a constant velocity there should be no acceleration. This means that the net force must be 0. Since there is clearly force applied in one direction, the frictional force oppose the applied force equally, so the frictional force is to the force that you apply to the chair.

Part 2. However, let's say you increase the force applied. Since the coefficient of kinetic friction is a constant, and since you were previously providing just enough force to balance the kinetic frictional force, and the force applied will be greater than the kinetic frictional force. Thus, due to the net force, the object will accelerate.

Is my reasoning correct?

Yeah, it all sounds fine to me.
 

1. What is frictional force?

Frictional force is a force that resists the motion of an object when it is in contact with another object or surface. It is caused by the microscopic roughness and irregularities of the two surfaces that are in contact with each other.

2. How is frictional force measured?

Frictional force can be measured using a force sensor or a spring scale. The force needed to overcome friction and move an object horizontally is equal to the frictional force. This force can be measured and compared to the weight of the object to determine the coefficient of friction.

3. What factors affect frictional force?

The factors that affect frictional force include the roughness of the surfaces in contact, the force pressing the surfaces together, and the type of materials in contact. The type of motion (sliding, rolling, or fluid flow) and the presence of lubricants can also affect frictional force.

4. How does frictional force compare to other types of forces?

Frictional force is a contact force, meaning it only occurs when two objects are in physical contact with each other. It is a non-conservative force, meaning it does not conserve mechanical energy. Unlike other forces, frictional force always acts in the opposite direction of the motion of an object.

5. How is frictional force important in everyday life?

Frictional force plays a crucial role in everyday life. It allows us to walk, drive vehicles, and use tools without slipping. It also helps to keep objects in place, such as furniture on a floor. However, frictional force can also be a hindrance, causing wear and tear on surfaces and reducing the efficiency of machines. Understanding and managing frictional force is essential in many industries, from transportation to sports equipment manufacturing.

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