Newton Beads - Revision history

imported>Stwikiadmin at 19:08, 6 September 2016

2016-09-06T19:08:36Z

← Older revision		Revision as of 19:08, 6 September 2016
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	* ''Friction'' is a resisting force. In this system, there is friction to be calculated at each of the points mentioned for tension above.		* ''Friction'' is a resisting force. In this system, there is friction to be calculated at each of the points mentioned for tension above.
	When the beads start falling from the upper bucket, we can calculate the tension, force of gravity and friction for each of the mentioned situations to find the direction the force is applied:		When the beads start falling from the upper bucket, we can calculate the tension, force of gravity and friction for each of the mentioned situations to find the direction the force is applied:
	{\| class="wikitable" style="color:black; background-color:#ddd; text-align: left; margin: auto"		{\| class="wikitable" style="color:black; background-color:#ddd; text-align: left; margin-right: auto"
	\|+ Direction of Forces		\|+ Direction of Forces
	\| '''+''' = up		\| '''+''' = up
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	The ~~Tension~~ in the system is always positive, while the force of gravity is always negative. This is because the tension in the string is generated by the force of gravity acting on the string. For each unit length of the string, it has a set amount of mass (The '''m'''/'''l''' in the Tension equation refers to this). This mass is affected by the acceleration of gravity, which gives us the force of gravity. The acceleration of gravity on the string generates a velocity, which gives us the tension. These two forces counteract each other, as the tension in the string is constantly pushing up and against the force of gravity. But why does the tension push up? Simply put, it is because of all the non-moving beads! the tension of the string is pushing on the pile of still beads in the buckets. This means that the string in the bucket on the table is pushing off the beads below it, against the force of gravity!		The tension in the system is always positive, while the force of gravity is always negative. This is because the tension in the string is generated by the force of gravity acting on the string. For each unit length of the string, it has a set amount of mass (The '''m'''/'''l''' in the Tension equation refers to this). This mass is affected by the acceleration of gravity, which gives us the force of gravity. The acceleration of gravity on the string generates a velocity, which gives us the tension. These two forces counteract each other, as the tension in the string is constantly pushing up and against the force of gravity. But why does the tension push up? Simply put, it is because of all the non-moving beads! the tension of the string is pushing on the pile of still beads in the buckets. This means that the string in the bucket on the table is pushing off the beads below it, against the force of gravity!

	The direction of the friction notably changes throughout the string's movement, due to ''where'' the friction is being generated. For the bucket on the table, the friction being applied is from the curve above. This curve minimizes the force of gravity applied downward into this bucket, and allows the tension to overcome and lift the beads up! However, once over the bend the friction in the curve is now working alongside the force of gravity. This causes the tension to lose the uphill battle, resulting in the beads being pulled down into the bucket on the floor!		The direction of the friction notably changes throughout the string's movement, due to ''where'' the friction is being generated. For the bucket on the table, the friction being applied is from the curve above. This curve minimizes the force of gravity applied downward into this bucket, and allows the tension to overcome and lift the beads up! However, once over the bend the friction in the curve is now working alongside the force of gravity. This causes the tension to lose the uphill battle, resulting in the beads being pulled down into the bucket on the floor!

			Although this demonstration is often used to describe the balance between kinetic and potential energy, that isn't entirely true when looking at the system. There is a definite energy transfer happening; The bucket on the table has potential energy, and as the beads fall out of it they do have kinetic energy. However, this does not give a full answer to the system, especially if you do this demonstration with a strand of metal beads and see the curve form above the lip. In this case, the tension in the strand is causing it to stand up and against the force of gravity, even as it continues to be pulled down!

	== Tips and Tricks ==		== Tips and Tricks ==

	* It is strongly suggested that you do not let students get close to the beads. This is because they will often want to grab and play with them, which tangles it and ~~is a hassle to untangle~~.		* It is strongly suggested that you do not let students get close to the beads. This is because they will often want to grab and play with them, which tangles them.
			* This demonstration pairs well with the [[Walk the Spool]] and the [[Potential and Kinetic Hot Wheels]] demonstrations.

imported>Stwikiadmin at 17:40, 6 September 2016

2016-09-06T17:40:04Z

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 == Safety Precautions ==
-Please read the General Safety section of the [[Demonstration Safety]] page before performing this demonstration.
+Please read the General Safety Precautions section of the [[Demonstration Safety]] page before performing this demonstration.
@@ Line 40: / Line 40: @@
 ===Full Explanation===
-'''''COMING SOON'''''
+This demonstration is primarily showing how a balances of forces affects the overall flow rate of the system. For this particular system, the forces of tension, gravity, and friction are all active, and each plays a different role in how the system flows.
 == Tips and Tricks ==
 * It is strongly suggested that you do not let students get close to the beads. This is because they will often want to grab and play with them, which tangles it and is a hassle to untangle.

imported>Stwikiadmin: Created page with "{| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right" | Physics: | Energy Transfer, Forces |- | Grade Range: | Elementary School..."

2016-03-02T14:47:57Z

Created page with "{| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right" | Physics: | Energy Transfer, Forces |- | Grade Range: | Elementary School..."

New page

{| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right"
| [[Physics]]:
| Energy Transfer, Forces
|-
| Grade Range:
| [[Elementary School]], [[Middle School]], [[High School]]
|-
| Format:
| [[Hands-on]], [[Stage]]
|}

The Newton Beads are a dynamic demonstration, allowing students to watch the immediate effect from adjusting a single factor. Be wary of grabby hands, or else you will have a tangled mess to deal with!

== Materials ==

* Two Buckets
* Newton Bead String

== Safety Precautions ==

Please read the General Safety section of the [[Demonstration Safety]] page before performing this demonstration.

== Demonstration ==

Preparation: Run the Newton Beads from one bucket into the other before the start of the show. That way, you can find any knots or tangles and remove them.

# Show the two buckets to the audience. Ask the students for ideas on how to move all the beads from one bucket to the other, without tangling them.
# Set the bucket of beads on a table or elevated surface, and the empty bucket on the floor beside it. Take the start of the string and drop it into the lower bucket. They will start to flow on their own!
# Remember to keep a hand at the mouth of the first bucket, to help guide the falling beads into the lower bucket. While the beads are falling, ask students for ways to stop it from flowing.
#* If they say to grab it, show that this does work. Grab the beads at the top of the higher bucket and they will stop!
#* If they say to lower the high bucket or raise the low bucket, show that this works as well!
# Once the string finishes falling, switch the buckets and run the string down again, while explaining the process.

== Why This Works ==

===Short Explanation===
The Newton Beads are a good way to show how ''Force'' and ''Energy'' are connected. When we set the buckets up, the beads in the high bucket have some ''Potential Energy'', or the potential for work. When they start to fall, the falling beads have ''Kinetic Energy'', or are doing physical work. This happens largely due to the ''Force of Gravity'', the force that pulls us down towards the Earth. But, we show that we can affect how fast the beads are falling by adjusting two things: the distance they travel, and the resistance they experience. If we adjust the height, we are adjusting how much Potential Energy is available. The higher we put the first bucket, the more Potential Energy is available, and the faster the beads can fall. If we grab the beads at the top of the falling string, we are applying ''Friction'', or a resisting force to the motion. If we only close our hand weakly around the beads, they can continue to fall, but at a lower speed. If we grab them tightly, they stop!

===Full Explanation===
'''''COMING SOON'''''

== Tips and Tricks ==

* It is strongly suggested that you do not let students get close to the beads. This is because they will often want to grab and play with them, which tangles it and is a hassle to untangle.