Force acting on a block against a wall

In summary, the problem involves a 1.0 kg wood block being pressed against a vertical wood wall by a 12N force at a 30 degree angle. The block is initially at rest and the coefficients of static and kinetic friction are given as 0.50 and 0.20 respectively. The task is to determine whether the block will move upward, downward, or stay at rest using the concept of static and/or kinetic friction. The conversation also includes references to images of the problem and a free body diagram.
  • #1
phm
5
0

Homework Statement


A 1.0 kg wood block is pressed (30 degrees) against a vertical wood wall by a 12N force as in the picture. If the block is initially at rest, will it move upward, downward, or stay at rest? In the book, it gives the us as 0.50 and the uk as 0.20.
Untitled.jpg

Free Body Diagram:
Untitled1.jpg


Homework Equations





The Attempt at a Solution


How do I solve this problem using static and/or kinetic friction?
 
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  • #2
If you put up your images on a hosting website (like flickr or photobucket, etc) it will be much easier since your attachments still haven't been approved and we won't be able to see them until they are.

Or you could just describe it?
 
  • #3
http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled.jpg
It's supposed to say 30degrees

And then the free body diagram (which I am not quite sure that I have done properly):
http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled1.jpg

Can you see these?
 
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  • #4
Or if you can't see those...
http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled1.jpg" [Broken]

and

http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled.jpg" [Broken]
 
Last edited by a moderator:
  • #5
Have you included gravity in your FBD? Once you have all of your forces for the FBD, look at which way the box could possibly move. You have the values of all of the forces including coefficients of friction, so how do these come into play?
 

1. What is the definition of force?

Force is a physical quantity that describes the interactions between objects. It is a push or pull that can change the motion or shape of an object.

2. How does the force acting on a block against a wall affect its motion?

The force acting on a block against a wall will cause the block to remain stationary, as the force is balanced by the reactive force of the wall. This is known as static equilibrium.

3. What factors affect the force acting on a block against a wall?

The force acting on a block against a wall is affected by the mass of the block, the angle at which the force is applied, and the coefficient of friction between the block and the wall.

4. Can the force acting on a block against a wall change over time?

The force acting on a block against a wall can change over time if there is a change in any of the influencing factors, such as an increase or decrease in the mass of the block or a change in the angle of application of the force.

5. How is the force acting on a block against a wall calculated?

The force acting on a block against a wall can be calculated using the formula F = μN, where F is the force, μ is the coefficient of friction, and N is the normal force exerted by the wall on the block. The normal force can be calculated using the formula N = mg cosθ, where m is the mass of the block, g is the acceleration due to gravity, and θ is the angle at which the force is applied.

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