Question about The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac
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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Jun 21, 2014 | Sears Craftsman LiftMaster Chamberlain...
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Feb 26, 2011 | Sears Craftsman LiftMaster Chamberlain...
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.
Jan 02, 2011 | liftmaster Chamberlain Garage Door Opener...
Dec 06, 2010 | liftmaster Chamberlain Garage Door Opener...
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.
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
Nov 11, 2010 | Sears Craftsman LiftMaster Chamberlain...
Mar 29, 2010 | Washing Machines
Mar 09, 2010 | Sears Craftsman LiftMaster Chamberlain...
Jan 05, 2009 | Sears Craftsman LiftMaster Chamberlain...
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