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Machines B/C
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amk578
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Re: Machines B/C
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CPScienceDude
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Re: Machines B/C
A seesaw's short side is 0.8m long, and a long side that is 2.4m long. A mass of 50kg sits on the short, and a mass of 70kg is dropped onto the long side.
A) What is the ideal mechanical advantage of the seesaw?
B) If the larger mass exerts a force of 850 N on the seesaw as it falls onto the effort side, how much does the smaller mass accelerate upward (m/s^2)?
A) What is the ideal mechanical advantage of the seesaw?
B) If the larger mass exerts a force of 850 N on the seesaw as it falls onto the effort side, how much does the smaller mass accelerate upward (m/s^2)?
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JoeyC
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Re: Machines B/C
A) 2.4/.8 = 3
B) Including the effects of gravity:
F=ma
a=F//m
F= Force of falling block * IMA - Force of gravity on stationary block
m = 50 kg
a=F/m
a = (850 N * 3 - 50 kg*9.81 m/s^2)/50kg = 41.19 m/s^2
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CPScienceDude
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UTF-8 U+6211 U+662F
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AwersomeUser
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Re: Machines B/C
Hehe I am in division B so I (kind of) am guessing the answer.
Next person/people, can you ask more/some division B level questions? Thanks in advance.
[hide]Wheels and axle, inclined planes (for the blades), possibly pulleys[/hide]UTF-8 U+6211 U+662F wrote: Identify examples of simple machines in a ceiling fan.
Next person/people, can you ask more/some division B level questions? Thanks in advance.
Last edited by AwersomeUser on September 26th, 2019, 5:12 pm, edited 2 times in total.
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UTF-8 U+6211 U+662F
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Re: Machines B/C
Yes! Although it helps to hide your answer behind spoiler tags like this so that other people can follow along the thread and figure out the answers for themselves. Also the blades would be more fitting examples of wedges.AwersomeUser wrote: ↑September 23rd, 2019, 2:30 pm Hehe I am in division B so I (kind of) am guessing the answer.
Wheels and axle, inclined planes (for the blades), possibly pulleysUTF-8 U+6211 U+662F wrote: Identify examples of simple machines in a ceiling fan.
Next person/people, can you ask more/some division B level questions? Thanks in advance.
Code: Select all
[spoiler]blablabla[/spoiler]-
AwersomeUser
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Re: Machines B/C
Ah! Sorry, I forgot to hide my answer...
1) Most machines have an actual mechanical advantage of more less one. True/False
2) The following is an example of what kind of simple machines?
3) A boy and a girl each sits on one end of a seesaw. If the 120 kg girl sits down after the boy, the boy rises/goes up by 0.4 m; and if the boy sits down after the girl, the girl rise/goes up by 20 cm. How heavy is the boy in kilogram?
(Hope the wording isn’t too confusing)
1) Most machines have an actual mechanical advantage of more less one. True/False
2) The following is an example of what kind of simple machines?
3) A boy and a girl each sits on one end of a seesaw. If the 120 kg girl sits down after the boy, the boy rises/goes up by 0.4 m; and if the boy sits down after the girl, the girl rise/goes up by 20 cm. How heavy is the boy in kilogram?
(Hope the wording isn’t too confusing)
2018-2019: Fossils, Solar System, Sci Quiz Bowl (Trial)
2019-2020: Circuit Lab, Machines, Mission (Im)possible, Reach For The Stars
2020-2021: Anatomy & Physilogy (if no conflicts) Astronomy, Enviromental Chemistry, Machines <-- I want to do these...
2019-2020: Circuit Lab, Machines, Mission (Im)possible, Reach For The Stars
2020-2021: Anatomy & Physilogy (if no conflicts) Astronomy, Enviromental Chemistry, Machines <-- I want to do these...
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AlfWeg
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Re: Machines B/C
I'll take a stab at it...AwersomeUser wrote: ↑September 26th, 2019, 5:09 pm Ah! Sorry, I forgot to hide my answer...
1) Most machines have an actual mechanical advantage of more less one. True/False
2) The following is an example of what kind of simple machines?
3) A boy and a girl each sits on one end of a seesaw. When the 120 kg girl sits down, the boy rises/goes up by 0.4 m; when the boy sits down, the girl rise/goes up by 20 cm. How heavy is the boy in kilogram?
(Hope the wording isn’t too confusing)
1) Most have more than one AMA
2) Belt and Pulley, or just 2 pulleys
3) 60KG? I'm more than a bit confused on this question, is this even possible?
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