Simple Machines B/Compound Machines C Question Marathon

Test your knowledge of various Science Olympiad events
User avatar
SWAnG
Member
Member
Posts: 80
Joined: January 18th, 2014, 11:22 pm
Division: C
State: MN
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by SWAnG »

lighter material, reduce friction/contact of other materials
Algorhythmic
Member
Member
Posts: 31
Joined: March 3rd, 2013, 4:07 pm
Division: C
State: PA
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by Algorhythmic »

And for similar reasons, explain why using higher masses in calculations might increase your accuracy.
User avatar
SWAnG
Member
Member
Posts: 80
Joined: January 18th, 2014, 11:22 pm
Division: C
State: MN
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by SWAnG »

You lose sensitivity, as the ratio of the actual weights to the mass of your lever decreases. (When it's balanced, it's not as accurate this way). Think about it, when you have a heavier bar, it requires more force to move it then a lighter bar.
User avatar
treeling
Member
Member
Posts: 25
Joined: March 4th, 2012, 1:21 pm
Division: C
State: CO
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by treeling »

lchs wrote:
Mathdino wrote:
Suppose that the pulley in the below image is connected to something weighing 10 kg, and I need to pull on it with 9 N of force to hold it up. What's the efficiency? [img]http://02.edu-cdn.com/files/89501_89600/89569/file_89569.jpg[/img]
I'm not so sure about this but I'll give it a shot...
IMA = (Force out of the machine)/(Force into the machine). 
So for this scenario, the Force into the machine would be 9N, I think. And the Force out of the machine would be 10kg * 9.8m/s/s = 98N. 
Therefore, the IMA = 98N/9N = 10.89? 
I feel like I need to use the visual somehow, but this is what I ended up doing... :?
I don't believe your answer is right.
IMA is Ideal Mechanical Advantage.
IMA is calculated by distance. Not force.
It your were calculating a MA with force that would be AMA (Actual Mechanical Advantage).
2016 Scores
PMS Inv/Reg/State

Bio-Process 2/1/5
Disease 2/1/1
Invasive 1/1/1
Mission Possible -/1/1
Picture This 2/1/3


2017 Scores
Reg/State

Disease -/-
Invasive -/-
Robot Arm -/-
WIDI -/-
User avatar
SWAnG
Member
Member
Posts: 80
Joined: January 18th, 2014, 11:22 pm
Division: C
State: MN
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by SWAnG »

Is it 9?
misterstealyogirl
Member
Member
Posts: 6
Joined: January 23rd, 2014, 10:42 am
Division: C
State: MN
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by misterstealyogirl »

Isn't the IMA 9? So the ideal force required would be 98/9 or 10.9 N? If so, then how can the force required be less? Unless I have the IMA wrong......
User avatar
SWAnG
Member
Member
Posts: 80
Joined: January 18th, 2014, 11:22 pm
Division: C
State: MN
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by SWAnG »

Agreed, I see the efficiency being over 100 percent, which is obviously not right
Algorhythmic
Member
Member
Posts: 31
Joined: March 3rd, 2013, 4:07 pm
Division: C
State: PA
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by Algorhythmic »

Explain why there is a difference in the calculation of IMA in the inclined plane and the wedge, with the IMA of the inclined plane being dependent on the hypotenuse length and the wedge being dependent on the overall length.
User avatar
SWAnG
Member
Member
Posts: 80
Joined: January 18th, 2014, 11:22 pm
Division: C
State: MN
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by SWAnG »

I thought wedge was dependent on the length of the slope?
Algorhythmic
Member
Member
Posts: 31
Joined: March 3rd, 2013, 4:07 pm
Division: C
State: PA
Has thanked: 0
Been thanked: 0

Re: Simple Machines B/Compound Machines C Question Marathon

Post by Algorhythmic »

Oops, I thought it would be the overall length of wedge because that would be considered the input distance.
Locked

Return to “2014 Question Marathons”

Who is online

Users browsing this forum: No registered users and 4 guests