# Tell me Physics facts!

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#1
I didn't take it for A-Level and wish I had. I might take the AS Level next year. SO TELL ME THINGS ABOUT PHYSICS!

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6 years ago
#2
Sometimes things slide down slopes. Sometimes they don't.
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6 years ago
#3
the word physics originates from the greek word for nature
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6 years ago
#4
In terms of mass,

moon<earth<sun<...
Spoiler:
Show
Yo' mama!
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6 years ago
#5
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#6
9.81
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6 years ago
#7
Staring at the sun gives you the ability to control yellow objects with your mind.
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6 years ago
#8
Something with a constant speed can accelerate whilst it's speed stays constant.
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6 years ago
#9
Lots of physical equations use imaginary numbers which don't actually exist.
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6 years ago
#10
(Original post by Protoxylic)
Something with a constant speed can accelerate whilst it's speed stays constant.
That's interesting. How does that work?

(Original post by Arithmeticae)
the word physics originates from the greek word for nature
That's cool, I love learning the origin of words
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6 years ago
#11
(Original post by pencil_case)
That's interesting. How does that work?

That's cool, I love learning the origin of words
acceleration is the change in velocity (which is a vector), so if you change direction you can accelerate while still having a constant speed (speed is a scalar and only has magnitude)

no problem
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6 years ago
#12
The sun...
0-0
---0-0--- 0-0
---0-0---

Is actually my son
YEEEEEEEAAAAAAAAAAAAHHHHHH

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6 years ago
#13
Something on the order of 10 trillion neutrinos are passing through your body every second
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6 years ago
#14
(Original post by Arithmeticae)
acceleration is the change in velocity (which is a vector), so if you change direction you can accelerate while still having a constant speed (speed is a scalar and only has magnitude)

no problem
That makes sense! Thanks
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6 years ago
#15
(Original post by pencil_case)
That's interesting. How does that work?
Notice I said speed. If an object rotates in circular motion about a fixed point with it's speed constant, it's vector velocity constantly changes as it's direction of motion constantly changes. An acceleration is the rate of change of velocity with respect to time therefore there must be an acceleration. This acceleration is towards the centre of the circle, the object obeys Newton's first law in the sense that it 'tries' to keep moving in a straight line, but there is a net force on that object due to it's mass and acceleration, F=ma. Therefore it moves in a circle because the force is always perpendicular to it's vector velocity and directed towards the centre.
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6 years ago
#16
Electrons have act as if they have no mass in carbon sheets (e.g. graphite)
http://physicsworld.com/cws/article/...-carbon-sheets
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6 years ago
#17
(Original post by Protoxylic)
Notice I said speed. If an object rotates in circular motion about a fixed point with it's speed constant, it's vector velocity constantly changes as it's direction of motion constantly changes. An acceleration is the rate of change of velocity with respect to time therefore there must be an acceleration. This acceleration is towards the centre of the circle, the object obeys Newton's first law in the sense that it 'tries' to keep moving in a straight line, but there is a net force on that object due to it's mass and acceleration, F=ma. Therefore it moves in a circle because the force is always perpendicular to it's vector velocity and directed towards the centre.
Thank you for taking the time to explain that to me very fascinating, thanks
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6 years ago
#18
(Original post by safesploit)
Electrons have act as if they have no mass in carbon sheets (e.g. graphite)
http://physicsworld.com/cws/article/...-carbon-sheets
Why didn't you link this to when Sheldon said that in the Big Bang?
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6 years ago
#19
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6 years ago
#20
Time travel into the future is possible.
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