This blog is very similar to the previous blog except in this we get an equation with V2 in it instead of V1
So we isolate V1 this time and get V1=-a(delta)t+V2---> let call this one :(
and here comes the substitution and simplification.
d=1/2(V1+V2)(delta)t
d=1/2(-a(delta)t+V2+V2)(delta)t
d=1/2(-a(delta)+2V2)(delta)t
d=V2(delta)t-1/2a(delta)t^2
this can also come from the graph as it basically shows the area of the large rectangle subtract the area of the triangle to get the area of the trapezoid.
If you think about it that way then you realize you stupid you can be. I know thats how i felt.
Saturday, October 23, 2010
Deriviation of equation 3
So this blog is about how to derive equation 3 from the two parent equations we already have.
So from a(delta)t= V2-V1 we isolate V2 to get V2=a(delta)t+V1---> we will call this :)
Now we substitute :) into another equation we already know from the graph which goes like
d=1/2(V1+V2)*(delta)t
then we get somthing like this and simplify it
d=1/2(V1+a(delta)t+V1)*(delta)t
d=1/2(2V1+a(delta)t)*(delta)t
d=V1(delta)t+1/2a(delta)t^2
So that was it.
pretty easy huh.
I know
So from a(delta)t= V2-V1 we isolate V2 to get V2=a(delta)t+V1---> we will call this :)
Now we substitute :) into another equation we already know from the graph which goes like
d=1/2(V1+V2)*(delta)t
then we get somthing like this and simplify it
d=1/2(V1+a(delta)t+V1)*(delta)t
d=1/2(2V1+a(delta)t)*(delta)t
d=V1(delta)t+1/2a(delta)t^2
So that was it.
pretty easy huh.
I know
Friday, October 22, 2010
The impossible to walk motion graphs
As you can see this is a distance time graph and its fairly simple. The object starts out at one meter away from the origin and stays for 1 second and starts moving away from the origin. Then, at 3 seconds it stays again for 3 seconds and at 6 seconds the object starts moving back towards the origin and stop at about 1.75 meters away from the origin.
Another distance time graph is shown here an it involves the basic movements like last one. Starts at 3 meters and walks towards the origin and stops and stays at 1.5 meters fro about a second and moves more closer and stays again and eventually starts moving away from it.
This is where it got hard. The velocity time graphs. The main concept was that negative velocity just meant moving in the backwards direction. This is pretty much showing that the object stayed put fro 2 second and started moving away form the origin at 0.5 m/s for 3 seconds and stopped again and started moving towards the origin at a constant velocity of 0.5 m/s
This is one of the hardest graphs there was. Now the velocity changes over a period of time so there is acceleration involved. For the first four seconds the object accelerates to a a velocity up to o.5 m/s away from the origin and then starts moving at a constant speed for two seconds and the walks towards the origin at a constant speed for 3 seconds. Then, the objects comes to a stop.
Yay!!! this stuff got easy again.
Another distance time graph.
The object starts moving away from the origin for 3.5 seconds starting from near a meter up to two meters.
The object stayed put for three seconds at 2 meters and starts moving away from the origin again till the graph ends.
Okay, so this one looks like one of the above ones but its not.
Its a velocity time graph showing an object moving away from the origin at a constant speed and then moving back towards the origin at the same constant speed and at around 6.75 seconds the object stops moving.
So those were the six graphs we walked for an in class lab and a brief description for all of them.
I know its not very accurate but hey we are not robots so we tried are best to match the default graphs. Some of which were really hard.
Thursday, October 21, 2010
Glowing Energy balls that can predict future!!! Yay
So today in physics we learned about different types of circuits and we had to answer a bunch of questions on our inferences. Here we go!!
1. Can you make the energy ball work?
Yes. By adding out fingers to both ends, we conduct the electrons to complete the circuit.
2.Why do you have to touch both metal contacts to make the ball work?
So that the circuit will be complete and the current can flow through the ball.
8) Given two balls (combine two groups): Can you create a circuit where both balls light up?
With two balls, we made a simple circuit with both balls in it, and both lit up.
Q9. What do you think will happen if one person lets go of another person's hand and why?
It does not connect so the circuit is opened.
10. Does it matter who lets go? Try it.
No, it does not matter who lets go because the circuit would be opened anyway. However, if the circuit created was a parallel circuit, then it would still work as in a parallel circuit it doesnt matter if one connection is broken.
11. Can you make a circuit with 2 energy balls, where one light up and one doesn't?
Ooh man, this one was a toughie! Well this one can be solved by using a parallel circuit.
12. What is the minimum amount of people required to do this?
It is possible with one person if the person has amazingly flexible fingers. If not then the two people can complete this task.
1. Can you make the energy ball work?
Yes. By adding out fingers to both ends, we conduct the electrons to complete the circuit.
2.Why do you have to touch both metal contacts to make the ball work?
So that the circuit will be complete and the current can flow through the ball.
3. Will the ball light up if you connect the contacts with any material?
The material that you use to connect the metal contacts is the vital source of whether or not the ball will light up. The material definitely cannot be insulators such as rubber, plastic, or glass, as they do not conduct electricity. If they do not conduct electricity, the circuit is not complete and thus the ball will not light up.
4. Which material will make the ball work?
Question 3 kinda tells that metal based materials will work only. We tested this out and it indeed work for materials such as the binder rings and the bottom of the table.
Question 3 kinda tells that metal based materials will work only. We tested this out and it indeed work for materials such as the binder rings and the bottom of the table.
5.This ball does not work on certain individuals, what could cause this to happen?
Those certain individuals most likely have dry skin. In order for the circuit to work, one should have enough mositure in their hands so that the circuit can flow properly.
Those certain individuals most likely have dry skin. In order for the circuit to work, one should have enough mositure in their hands so that the circuit can flow properly.
6. Can you make the energy ball work with all 5-6 individuals in your group? Will it work with the entire class?
Yes, if every member in our group has physical contact with each other's skin, and each metal contact on the ball is touched by a different person, the ball will light up. It worked with the entire class as well since it is the same circuit, except bigger or longer. Fortunately no one in our class proves question number five correct, and the electricity is transferred through every individual.
Yes, if every member in our group has physical contact with each other's skin, and each metal contact on the ball is touched by a different person, the ball will light up. It worked with the entire class as well since it is the same circuit, except bigger or longer. Fortunately no one in our class proves question number five correct, and the electricity is transferred through every individual.
7.) What kind of circuit is formed with the energy ball?
The energy ball (with human hands) forms a simple circuit.
The energy ball (with human hands) forms a simple circuit.
8) Given two balls (combine two groups): Can you create a circuit where both balls light up?
With two balls, we made a simple circuit with both balls in it, and both lit up.
Q9. What do you think will happen if one person lets go of another person's hand and why?
It does not connect so the circuit is opened.
10. Does it matter who lets go? Try it.
No, it does not matter who lets go because the circuit would be opened anyway. However, if the circuit created was a parallel circuit, then it would still work as in a parallel circuit it doesnt matter if one connection is broken.
11. Can you make a circuit with 2 energy balls, where one light up and one doesn't?
Ooh man, this one was a toughie! Well this one can be solved by using a parallel circuit.
12. What is the minimum amount of people required to do this?
It is possible with one person if the person has amazingly flexible fingers. If not then the two people can complete this task.
Wednesday, October 20, 2010
Right hand rules are awesome!!!
The genius Mr.Oersted came up with brilliant right hand rules.
As stated in previous post the right hand rule shows either the direction of the current or the direction of the magnetic field if given the information of one or the other.
The right hand rule two has same conditions as right hand rule one but instead of the thumb pointing towards the current flow it points towards the north pole of the magnet and the curling fingers point toward the current flow.
Faraday also was a genius and came up with a right hand rule three and that stated if a conductor carrying current is placed between opposite poles of a magnet, a force will act on the conductor. The right hand kicks again as in order to find out which way the conductor will go, the straight fingers must point towards the direction of the magnetic lines and the thumb must point towards the direction of the current and the face of the palm will show which way the force will act upon the conductor.
those are three major rules regarding electromagnetism.
As stated in previous post the right hand rule shows either the direction of the current or the direction of the magnetic field if given the information of one or the other.
The right hand rule two has same conditions as right hand rule one but instead of the thumb pointing towards the current flow it points towards the north pole of the magnet and the curling fingers point toward the current flow.
Faraday also was a genius and came up with a right hand rule three and that stated if a conductor carrying current is placed between opposite poles of a magnet, a force will act on the conductor. The right hand kicks again as in order to find out which way the conductor will go, the straight fingers must point towards the direction of the magnetic lines and the thumb must point towards the direction of the current and the face of the palm will show which way the force will act upon the conductor.
those are three major rules regarding electromagnetism.
Points from pages 582-592
-A magnetic field is the distribution of a magnetic force in the region of a magnet.
-A test compass is used to map a magnetic field.
-A magnet attracts certain materials thats are not magnets. These are called ferromagnetic materials.
-Domain theory states that all large magnets are made up of many smaller and rotatable magnets, called dipoles, which can interact with other dipoles close by. If dipoles line up, then a small magnetic domain is produced.
-Oersted's principle states that charge moving through a conductor produces a circular magnetic field around the conductor.
-Oersted also came up with some basic right hand rules relating electricity and magnetism.
- Right hand rule one states that in order to find out which way the magnetic field is going, grasp the conductor with your right hand with the thumb pointing towards the direction of the conventional flow of the current and the curling fingers will indicate the direction of the magnetic field.
- Right hand rule two states that if the conductor is wrapped in a coils and the thumb of the right hand is pointing towards north, then the curling fingers will indicate the direction of the conventional current flow.
-A test compass is used to map a magnetic field.
-A magnet attracts certain materials thats are not magnets. These are called ferromagnetic materials.
-Domain theory states that all large magnets are made up of many smaller and rotatable magnets, called dipoles, which can interact with other dipoles close by. If dipoles line up, then a small magnetic domain is produced.
-Oersted's principle states that charge moving through a conductor produces a circular magnetic field around the conductor.
-Oersted also came up with some basic right hand rules relating electricity and magnetism.
- Right hand rule one states that in order to find out which way the magnetic field is going, grasp the conductor with your right hand with the thumb pointing towards the direction of the conventional flow of the current and the curling fingers will indicate the direction of the magnetic field.
- Right hand rule two states that if the conductor is wrapped in a coils and the thumb of the right hand is pointing towards north, then the curling fingers will indicate the direction of the conventional current flow.
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