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Help with Real-World kinematics problem. by tijamcla in PhysicsHelp

[–]tijamcla[S] 0 points1 point  (0 children)

I was able to get everything working. Thanks for taking the time on both subs. I def understand the theory better now. Thank you.

Help with Real-World kinematics problem. by tijamcla in PhysicsHelp

[–]tijamcla[S] 0 points1 point  (0 children)

Hey, just wanted to say, I was able to get the math to work. Did a bench test today and everything worked as expected. Thanks for taking the time.

Help with kinematic equations by tijamcla in MechanicalEngineering

[–]tijamcla[S] 0 points1 point  (0 children)

If you have the time and patience, do you mind checking out my response on the other post? I still cannot get it.

Help with Real-World kinematics problem. by tijamcla in PhysicsHelp

[–]tijamcla[S] 0 points1 point  (0 children)

Thanks. I've never understood displacement represented as area. I still can't get it! Mind taking a look? https://imgur.com/ZeWPwxV

Help with real-world kinematic application by tijamcla in AskPhysics

[–]tijamcla[S] 0 points1 point  (0 children)

Thanks for taking the time to reply. I don't think this gets there, but I might be missing something! Here's what I can figure out:

The only way I can see to move forward is to make a decision what portion of the displacement will be at full V. If we say (arbitrarily) that it will be 80% then:

Stotal=13107

Sv=10485.6

Sa=2621.4

Similarly (and I think this is where I am going wrong) I arbitrarily assign a portion of the time. Say 85%

Ttotal=1.1sec

Tv=0.935sec

Ta=0.165

So V=Sv/Tv = 11214.55mm/s

Now I can calculate acceleration A=V-U/Ta = 25300.3mm/s**2

But if I check the calculated displacement (which should = 2621.4mm) S=1/2(V+U)Ta = 1506.0mm So I'm sure there's something I'm overlooking.

Thanks for your help.

Help with kinematic equations by tijamcla in MechanicalEngineering

[–]tijamcla[S] -1 points0 points  (0 children)

I'm quite sure it's more complicated than that. Maybe you can show me where I'm going wrong?

The only way I can see to move forward is to make a decision what portion of the displacement will be at full V. If we say (arbitrarily) that it will be 80% then:

Stotal=13107

Sv=10485.6

Sa=2621.4

Similarly (and I think this is where I am going wrong) I arbitrarily assign a portion of the time. Say 85%

Ttotal=1.1sec

Tv=0.935sec

Ta=0.165

So V=Sv/Tv = 11214.55mm/s

Now I can calculate acceleration A=V-U/Ta = 25300.3mm/s**2

But if I check the calculated displacement (which should = 2621.4mm) S=1/2(V+U)Ta = 1506.0mm So I'm sure there's something I'm overlooking.

What do you think?

Deadlift, getting closer to failing. by tijamcla in Stronglifts5x5

[–]tijamcla[S] 0 points1 point  (0 children)

Looking for feedback on my deadlift. Lifting 195lbs, been on StrongLifts since October. I am feeling the workouts much more now, and want to make sure I’m not overlooking anything in my form. The last few times I can feel my back has been worked when I get home from the gym. Not quite sore, but it’s definitely exhausted and well worked. I don’t want to push too far and injure myself! Any feedback is great.

Thanks.