Calculating Contact Forces for Pushing Boxes

In summary: The normal force is the force that is perpendicular to the perpendicular vector between the two boxes.
  • #1
dorian_stokes
25
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I've looked everywhere to find how do you calculate contact forces, like if you were pushing boxes. Don't want the answer just need to know how to do the calculations.
 
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  • #2
It depends on the problem, but you'll be using Newton's laws. Post a specific problem in the Intro Physics section (showing your work) and you'll get plenty of specific advice.
 
  • #3
contact forces with coefficient of friction

If you have two boxes being pushed where both have different masses and both boxes have a coefficient kinetic friction how do you calculate the normal force between the two?
 
  • #4
(two threads with same question merged into one thread).

Dorian, as Doc says, you should post your specific schoolwork question in the Introductory Physics sub-form in the Homework Help section of the PF, and show your attempt at a solution. You should get good advice in that forum.
 
  • #5
I'm trying not to use the exact question. Here's a revised one. Lets' say that a person is moving two boxes. M1 is 14 kg and M2 is 10 kg and the coefficients of kinetic fricton between both the boxes and the floor is .10. What is the Normal force between the two boxes? Please can you explain this in as simple terms as possible?
 
  • #6
Draw a diagram...see where the force vectors of the weight overlap and don't overlap...
 
  • #7
dorian_stokes said:
I'm trying not to use the exact question.

Thread moved to Homework Help. And why would you be trying to not use the actual question? A bit worried that your professor and fellow students can use Google?...
 
  • #8
dorian_stokes said:
What is the Normal force between the two boxes?
What do you think it would be? If a box with mass m is sitting on a horizontal surface, what do you think the normal force is between the box and the surface?

Hint: Analyze the vertical forces acting on the box, one of which is the normal force.

The same thinking is needed when you have two boxes.
 

FAQ: Calculating Contact Forces for Pushing Boxes

1. How do you calculate the contact force when pushing a box?

The contact force when pushing a box can be calculated using the formula F = μN, where F is the contact force, μ is the coefficient of friction, and N is the normal force. The coefficient of friction depends on the material of the box and the surface it is being pushed on, while the normal force is equal to the weight of the box.

2. What is the difference between static and kinetic friction?

Static friction is the force that must be overcome to set an object in motion, while kinetic friction is the force that opposes the motion of an object. In the case of pushing a box, static friction is the initial force required to start moving the box, while kinetic friction is the force that must be continuously applied to keep the box in motion.

3. How does the weight of the box affect the contact force when pushing?

The weight of the box directly affects the normal force, which in turn affects the contact force. The greater the weight of the box, the greater the normal force and therefore the greater the contact force needed to push the box. This is why it is easier to push a lighter box compared to a heavier one.

4. Can the coefficient of friction change when pushing a box?

Yes, the coefficient of friction can change depending on the surface the box is being pushed on. For example, pushing a box on a smooth surface will have a lower coefficient of friction compared to pushing the same box on a rough surface. Additionally, the coefficient of friction can also change if the material of the box or the surface is altered in any way.

5. Are there any other factors that can affect the contact force when pushing a box?

Yes, there are other factors that can affect the contact force when pushing a box. These include the angle at which the force is applied, the speed at which the box is being pushed, and the presence of any external forces such as wind or inclines. These factors can impact the overall force required to push the box and should be taken into consideration when calculating the contact force.

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