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What force are involved when a person opens a door

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The door was once at rest and now it is moved so a force must be involved.
If the force you applied to the door is big enough, the door will move. The door will even apply its own force to you. Whenever an object A exerts a force on another particle B, B simultaneously exerts a force on A with the same magnitude in the opposite direction. Oh and since we're on earth there's always the force of gravity to consider. So you and the door don't float away.

Posted on Nov 20, 2009

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Posted on Jan 02, 2017

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What's redheadchick101's password


If the person, who did setup this account does not know his / her password, how should anyone else know it?

Please when you loose you door key, you can\'t open the door. And unless someone else has a key, the door can\'t be opened, without force.

We can\'t guess any password and any attempt to open an account not belonging to the person self, is illegal and can be punished.

Please don\'t ask us to do something illegal. That apart from it will be impossible to crack this.

Oct 13, 2014 | Facebook Apps

1 Answer

What does the purple button light flashing on 1/2 horsepower craftsman garage door opener


I think the adjustment mode is on.

For example, that's from Craftsman manual:

""
Setting the Force
The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door.
1. Locate the purple button on the left panel of the motor unit (Figure 1).
2. Push the purple button twice to enter the opener into Force Adjustment Mode (Figure 2). The LED (Indicator Light) will flash quickly.
3. Push the remote control or control console (Figure 3). The door will travel to the DOWN (close) position.

""

Actually, you should just read carefully your garage door opener unit's manual.

Craftsman Garage Door Opener Remote

Jun 21, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Craftsman 1/2 horsepower garage door opener will not close when properly whenever the temp drops below 40. Why is this?


Define "close properly".
When it gets cold nothing moves easily. The door requires more force to move. The opener will apply a set measure of force before giving up and switch directions (both up or down). This maximal force applied (up and down separately) is adjustable. The purpose is to prevent a person from being squished to death by the door. As the door moves up, apply resistance to it. If it doesn't take much to cause it to go the other way (or stop), then you need to adjust. If it will lift you as well, then you need to adjust. Do the same as the door goes down.

Feb 26, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door only opens partially and stops.


Use the pull cord and disconnect the opener from the door. Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected? Next, lift the door by hand from the bottom to the top. Is it moving smoothly? If not, lubricate the axles of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well. Are all cables in all the pulleys, there are 4. After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Gary

Jan 02, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

The garage door goes up one foot and stops..its a liftmaster professional half horsepower


Disconnect the opener from the door. Operate the opener. It should go back and forth smoothly.
Lift the door. It should go up and down without any problems.
After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Dec 06, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...


I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.



The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.

Nov 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Zanussi FL884 Washing Machine door lock broken.


More likel that the door latch or handle is broken.
Only way to open door now is to remove the top cover and force the door lock open from inside, you may possibly break the lock by doing this, but there is really no other alternative.

Mar 29, 2010 | Washing Machines

1 Answer

I have a new Sears 315mhz garage door opener and the door fails to reverse when an object is placed under the door


It sounds like the force adjustment may be set too high. Check this:

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.


The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.



Mar 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

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