## Machines B/C

amk578
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### Re: Machines B/C

CPScienceDude wrote:
September 18th, 2019, 7:21 am
B?
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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)?
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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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### Re: Machines B/C

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### Re: Machines B/C

Someone else ask the question lol.
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### Re: Machines B/C

Identify examples of simple machines in a ceiling fan.

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### Re: Machines B/C

Hehe I am in division B so I (kind of) am guessing the answer.
UTF-8 U+6211 U+662F wrote: Identify examples of simple machines in a ceiling fan.
[hide]Wheels and axle, inclined planes (for the blades), possibly pulleys[/hide] 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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### Re: Machines B/C

AwersomeUser wrote:
September 23rd, 2019, 2:30 pm
Hehe I am in division B so I (kind of) am guessing the answer.
UTF-8 U+6211 U+662F wrote: Identify examples of simple machines in a ceiling fan.
Wheels and axle, inclined planes (for the blades), possibly pulleys

Next person/people, can you ask more/some division B level questions? Thanks in advance.
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.

Code: Select all

``[spoiler]blablabla[/spoiler]``

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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)
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### Re: Machines B/C

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)
I'll take a stab at it... 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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