Speed of Lever at Rest w/ 3lb Weight Attached

AI Thread Summary
The discussion centers on calculating the speed of a lever at rest with a 3lb weight attached, influenced by a 40lb force from an extended spring. The lever is 3 feet long, with the pivot point positioned 1 foot from the top and 2 feet from the bottom, while the lever itself weighs 2.1 lbs. Participants are encouraged to use a previously suggested approach for similar problems. Additionally, there's a reminder to post unrelated homework questions in the appropriate forum section. The thread emphasizes the need for clarity in calculations related to the lever's mechanics.
poopforfood
Messages
13
Reaction score
0
So I have a simple lever that is connected to an extension spring. When the extension spring is exteneded it applies a force of 40lbs on the lever. The lever is 3 feet long and the pivot point is 1 foot from the top and 2 foot from the bottom. The lever weighs 2.1 lbs and has a 3lb weight attached to the bottom. Can anyone help me figure out what the speed is at the bottom of the arm. I attached a picture to this thread. The speed I need is the point when the lever is at rest as seen in the diagram.
 

Attachments

  • lever.jpg
    lever.jpg
    4.6 KB · Views: 481
Engineering news on Phys.org
You just posted a very similar question. Use the same approach that tiny-tim suggested. Any other homework problems should be posted in the appropriate board.
 
Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'
Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
Back
Top