30 seconds is good; with good accuracy you should be getting scores near 45-48. Test portion helps a lot though.For Div B how fast are you guys finding the ratios for the 3 masses? My partner and I were able to find the ratios in about 30secs to 1 minute at our most recent competitions. I think it's pretty slow. . In all competitions we've gone to, almost all the teams have dominated in the test portion. Therefore, our machine score is very crucial. Our machine is extremely accurate we just want to go faster. What do you guys think? What time should I be aiming for?
Haha, my partner and I rock the test and were eh in the ratios, we realized our machine got a little off though so we fixed that and now we got a ratio .03 and .1 off in around 40 seconds I think..For Div B how fast are you guys finding the ratios for the 3 masses? My partner and I were able to find the ratios in about 30 secs to 1 minute at our most recent competitions. I think it's pretty slow. . In all competitions we've gone to, almost all the teams have dominated in the test portion. Therefore, our machine score is very crucial. Our machine is extremely accurate we just want to go faster. What do you guys think? What time should I be aiming for?
Of course, this isn't the place for official rule clarifications. But regarding phone usage, here's a quote from the general rules:The rulebook states any calculator can be used. Does this include calculators or calculator apps found on phones?, or does this mean any calculator with physical buttons?
So my interpretation is that you're not allowed to use any phone calculator at all in this event. In addition, I'd assume that any normal calculator that you could use in a math class could be used in this event, as the rules stateAll electronic devices capable of external communication (including cell phones) must be turned off, unless expressly permitted in the event rule and left in a designated spot if requested.
What's your desire to use a phone calculator? Nearly all physical calculators are easier to use, have a readable memory, and many are programmable as well, such as the TI-84 (which can help you in the competition).and any type of calculators for use during both competition parts. Calculators do not need to be impounded.
Hello, thanks for the awesome drawing! It definitely helped me understand the concept of the levers better.The left lever is pushing upwards on the right lever at the point of contact.If we look at the left lever alone, what mass would need to be on the other side of the lever to have it at equilibrium? From the equation, we get m=Y*d1/d2.
The right lever is pushing downwards on the left lever at the point of contact. If we look at the right lever alone, what "mass" would need to be pushing upwards on the right lever? From the equation, we get n=R*d4/d3
Now, these two "masses" are equal (this comes from newtons third law, if we simply turn them into forces).so, we get that Y*d1/d2=R*d4/d3. Solving, the ratio Y/R=d4*d2/(d3*d1).
Now the best part of this equation is that d2 and d3 can be measured in advance, and you simply have to plug in your distances.
I'm pretty tired right now (school and stuff) so please correct me if I made a mistake.
The rules say you need a class 1 and class 2 lever, each no more than 40 centimeters (for the class 1 that is the distance from load to effort, and for class 2 it is the distance from the fulcrum to the effort). You know d2 and d3 because they are always the same. d2 is the distance from the fulcrum of the class 1 lever to the right end of the lever (which depends on how your device is made). For our device, it is about 20 cm because I placed the fulcrum exactly in the middle of the 40 cm lever. Same thing for d3, which is the distance from the fulcrum of the class 2 lever to the left end of it, but for our device d3 is 40 cm, the maximum allowed length for the lever.Hello, thanks for the awesome drawing! It definitely helped me understand the concept of the levers better.The left lever is pushing upwards on the right lever at the point of contact.If we look at the left lever alone, what mass would need to be on the other side of the lever to have it at equilibrium? From the equation, we get m=Y*d1/d2.
The right lever is pushing downwards on the left lever at the point of contact. If we look at the right lever alone, what "mass" would need to be pushing upwards on the right lever? From the equation, we get n=R*d4/d3
Now, these two "masses" are equal (this comes from newtons third law, if we simply turn them into forces).so, we get that Y*d1/d2=R*d4/d3. Solving, the ratio Y/R=d4*d2/(d3*d1).
Now the best part of this equation is that d2 and d3 can be measured in advance, and you simply have to plug in your distances.
I'm pretty tired right now (school and stuff) so please correct me if I made a mistake.
Where you say m and n, what exactly are you referring to? I'm assuming that the variables are the unknown masses, but I'm not sure, since you said Y and R.
Also, I'm pretty confused on how you can already know d2 and d3 from the start. If you knew those, wouldn't you know d1 and d4 as well?
Just general clarification from anyone would be awesome. Thanks, and thanks again for understanding I'm a noob at this event (and Div C in general)!
You don't have to know d2 and d3 from the start if you decide to make the connection point between the two levers variable. While many teams keep these points fixed so that d2 and d3 would be constant it is not necessary. Also many devices I have seen have rotated the 2nd class lever and increased the length of the material connecting the two levers together so that the levers are stacked on top of each other or at right angles. I am not saying which is better or worse. Each have their own advantages.The rules say you need a class 1 and class 2 lever, each no more than 40 centimeters (for the class 1 that is the distance from load to effort, and for class 2 it is the distance from the fulcrum to the effort). You know d2 and d3 because they are always the same. d2 is the distance from the fulcrum of the class 1 lever to the right end of the lever (which depends on how your device is made).
Also, I'm pretty confused on how you can already know d2 and d3 from the start. If you knew those, wouldn't you know d1 and d4 as well?
Just general clarification from anyone would be awesome. Thanks, and thanks again for understanding I'm a noob at this event (and Div C in general)!
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