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BobbyB2
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Is the concept the same? If I am able to bench press a maximum of 200lbs, and I were to push with full force a scale bolted in a stationary position at the weakest point of my bench press motion, would the scale read 200lbs?
No, at the weakest point, you are just barely able to get the bar off your chest. If the bar+weights is 200lb, then the force is 200 lb. If you couldn't apply any force at the weakest point, you'd choke yourself to death.pallidin said:At the "weakest point of my bench press motion" the scale would read 0, as no force is being applied.
That was my point with the dumbell comment. You can lift more with a bar than with dumbells because you have 1 axis of stability to deal with instead of 2. And if the setup described by the OP is completely immoble, then you have 0 axes of stability to deal with instead of 2. Essentially, you can push as hard as you want and not have to worry about the force being perfectly vertical.Emreth said:You can probably push more with a setup like that since its more stable.
russ_watters said:That was my point with the dumbell comment. You can lift more with a bar than with dumbells because you have 1 axis of stability to deal with instead of 2. And if the setup described by the OP is completely immoble, then you have 0 axes of stability to deal with instead of 2. Essentially, you can push as hard as you want and not have to worry about the force being perfectly vertical.
It didn't say bolted to what, but fair enough.Emreth said:Well he says its bolted in the first posting.
I don't know how much more force he could apply due to the added stability, but if he can only apply 200 lb, the 200-45 is the 200 lb he is capable of generating minus the 45 lb of the bar.What is 200-45 about?He can probably push 300 lbs with a bolted scale.
BobbyB2 said:let me clarify:
senario 1 - a man lifts a 200lbs plate off his chest. we will call the position of the starting point on his chest '0'. his muscles are only capable of lifting this 1 time and he is not capable of lifting any more weight than this. this is called his 1 rep max.
senario 2 - the same man has a scale the exact size and shape as the plate in scenario 1 bolted in place at position '0'. he pushes on the scale with all his force as if to try and do the same motion as from scenario 1.
question: does the scale reach 200lbs? does it pass the 200lbs mark? etc..?
assumption: this is a perfect world and balance does not come into play.
Thanks for all the responses so far!
Infamous_01 said:Force = mass x acceleration
1kg = 2.2 lbs, 200 lbs = 91kg
91 kg barbell resting on a scale on your hand without any movement will show 91 kg X 9.8m/s^2 netwons (equal to 891.8N or 91kg or 200lbs)
Now when you accelerate uniformly it at say 0.2 m/s the force will now become 91 kg x 10 Newtons which is also equal to 93kg. A 3 kg or 6.6lb increase reading on the scale
So in other words acceleration has everything to do with it. The faster you try to lift it, the heavier it will be until velocity is constant.
Emreth said:no it will go higher. you can push more in that case.
stewartcs said:Most everyone lifts the weight at a constant velocity so the additional acceleration doesn't exist.
CS
Office_Shredder said:Assuming the person doesn't try to cheat, it should weigh 200 pounds, since that has been identified as the most he can push. OTOH, if he slammed his hands into the scale, he might be able to get a higher reading (I mention this solely to forewarn you if you're applying this to an actual device)
Infamous_01 said:But from rest to that velocity there will be acceleration, until the velocity is constant like i mentioned.
Lifting weight and pushing a scale are two different types of physical activities. Lifting weight involves exerting force against gravity to move an object, while pushing a scale involves exerting force against a fixed object to measure its weight.
Lifting weight typically burns more calories than pushing a scale, as it requires more muscle engagement and movement. However, the number of calories burned will depend on the intensity and duration of the activity.
Lifting weight is generally considered better for building muscle, as it allows for progressive overload and targets specific muscle groups. Pushing a scale may also engage some muscles, but it is not as targeted as lifting weight.
Yes, lifting weight and pushing a scale can have different effects on the body. Lifting weight can help increase muscle mass and strength, while pushing a scale may have a more limited impact on muscle development. Additionally, pushing a scale may be better for assessing overall body weight and strength.
For beginners, it is generally recommended to start with lifting weight under the guidance of a trained professional. This allows for proper form and technique to be learned, reducing the risk of injury. Pushing a scale can also be a good starting point for assessing overall strength and setting goals for weightlifting in the future.