Another Newton law theoroy question

In summary, the question is asking if the force required to push a chair at a constant speed of 2v is double the force required to push it at a constant speed of v. This can be solved using Newton's second law, which states that if the net force acting on an object is zero, the object will either remain at rest or continue moving at a constant velocity. In this case, since the velocity is constant, the net force must be zero. Therefore, the force being applied must be counteracted by some other force, which is likely friction. However, more information would be needed to solve the problem accurately.
  • #1
narutodemonki
7
0

Homework Statement



pushing an armchair across a carpeted or at constant speed v you apply a force of 100N
if you push same chair at constant speed 2v(twice as fast) you mush push with a force?
a)100N
B)141N

The Attempt at a Solution


Newtons second law? if the net force acting on object is zero or if no force is acting on object..objects at rest will stay at rest and objects in uniform motion will stay in uniform motion in a constant velocity straight lien unless acted on by a non negative resultant force.

...since the speed is constant that means no force is being applied? but the initial force was 100N? and was 100N for a while until the 2v speed was reached?
 
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  • #2
If the velocity is constant, that means that no net force is being applied. Which means that something is counteracting the 100N being applied, what force is that?

If you double the velocity, how will that resistive force respond? (look at how the equation for that particular resistive force varies with velocity)
 
  • #3
It sounds like a friction problem, however I'm not sure you have given enough of the details to solve.
 
  • #4
physhelper301 said:
It sounds like a friction problem, however I'm not sure you have given enough of the details to solve.

Well the question is straight from the practice section of the text. That is all the info they have given.
 
  • #5
narutodemonki said:
Well the question is straight from the practice section of the text. That is all the info they have given.
Yes, for this type of problem (simplicity-wise), its enough information.
 

FAQ: Another Newton law theoroy question

1. What is the third law of motion in Newton's theory?

The third law of motion states that for every action there is an equal and opposite reaction. This means that whenever an object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.

2. How does the third law of motion apply to everyday life?

The third law of motion can be seen in everyday life, such as when we walk. As we push our foot back on the ground, the ground pushes forward on our foot, propelling us forward. Another example is when we sit on a chair, our weight pushes down on the chair and the chair pushes back up with an equal force.

3. Can the third law of motion be violated?

No, the third law of motion is a fundamental law of physics and cannot be violated. It has been proven through numerous experiments and observations.

4. Is the third law of motion applicable in space?

Yes, the third law of motion is applicable in all situations, including in space. In the absence of air resistance, the forces between two objects in motion are equal and opposite, just as on Earth.

5. What is the relationship between mass and acceleration in the third law of motion?

The third law of motion does not directly relate to mass and acceleration. However, in order for an object to accelerate, there must be a net force acting on it. The third law of motion explains that the forces acting on the object are equal and opposite, but the mass and acceleration are determined by other factors such as the object's size and the strength of the forces.

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