https://padlet.com/mrowzee/Per8PithBallLab VOCABULARY: charging by friction, conductor, insulator, charge by conduction, polarization, grounding, neutral, negative, positive, electrons en-us 2019-04-16 15:22:13 UTC 2025-11-01 23:11:16 UTC hello@padlet.com mrowzee https://padlet.com/mrowzee/Per8PithBallLab/wish/351979958 When rubbed by the wool cloth (black), the vinyl strip (gray) becomes negatively charged.  We were told that this combination provides a negative source in the lab.  The vinyl actually becomes negatively-charged by transferring electrons from the cloth to the vinyl surface. This is a charging by friction event.  These electrons stay where they are placed on the vinyl surface because vinyl is an insulator (electrons do not move freely on its surface). 

]]> 2019-04-16 14:15:49 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/351979958 tewitte https://padlet.com/mrowzee/Per8PithBallLab/wish/352118920 The negative charge and electrons are transferred from the vinyl, which was negatively charged by friction, to the originally neutral pith ball, and because the pith ball is a conductor  the pith ball now has a negative charge]]> 2019-04-16 19:50:04 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352118920 https://padlet.com/mrowzee/Per8PithBallLab/wish/352119090 When you bring the negative charged vinyl close to the neutral charge pith ball, the negative vinyl attracts the neutral pith ball because the pith ball had been grounded which means it will have a neutral charge.When two objects have different charges they are attracted. ]]> 2019-04-16 19:50:43 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352119090 tewitte https://padlet.com/mrowzee/Per8PithBallLab/wish/352119392 When the pith ball was made to have a negative polarization by the vinyl, an insulator, charging it by conduction. If a positive source were to come near it, it would attract to it]]> 2019-04-16 19:51:54 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352119392 https://padlet.com/mrowzee/Per8PithBallLab/wish/352119660 the pith ball is initially attracted to the vinyl because the vinyl has a negative charge (due to charging by friction) and the ball is neutral. Because the ball is a conductor, its electrons move freely, so they are manipulated by the excess electrons in the vinyl. ]]> 2019-04-16 19:52:57 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352119660 https://padlet.com/mrowzee/Per8PithBallLab/wish/352120117 When the pith ball and the negative vinyl touch, the electrons from the negative vinyl are transferred to the pith ball causing both objects to have the same charge. The charge happened by conduction therefore it will repel each other. ]]> 2019-04-16 19:54:51 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352120117 tewitte https://padlet.com/mrowzee/Per8PithBallLab/wish/352120857 The charge dissipated
 and was grounded as a result of someone who is touching the ground touching it]]> 2019-04-16 19:56:55 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352120857 https://padlet.com/mrowzee/Per8PithBallLab/wish/352120894 when the pith ball is touching the vinyl, the electrons are being transferred through polarization. Because the ball is a conductor and its electrons move freely, when in contact with the negatively charged vinyl the excess electrons make their way onto the ball and give it a negative charge.]]> 2019-04-16 19:57:04 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352120894 https://padlet.com/mrowzee/Per8PithBallLab/wish/352121224 When both the pith ball and the vinyl have touched each other they will repel each other because both objects have been charged with negative. ]]> 2019-04-16 19:58:21 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352121224 jjcarey https://padlet.com/mrowzee/Per8PithBallLab/wish/352121251 When the neutral pith ball is near the negatively charged vinyl the pith ball are attracted. The electrons in the pith ball flock to one side and the electrons on the pith ball are attracted to the electrons in the ball.]]> 2019-04-16 19:58:29 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352121251 https://padlet.com/mrowzee/Per8PithBallLab/wish/352121332 When the pith ball and vinyl are put close together they are attracted first because the vinyl is negatively charged from the electrons transferred to it from the cloth and the ball is a neutral conductor so it is attracted to the extra electrons on the vinyl.]]> 2019-04-16 19:58:57 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352121332 https://padlet.com/mrowzee/Per8PithBallLab/wish/352121335 after being removed and put back into proximity, the ball and vinyl now repel each other. This occurs because both have a negative charge now after polarization occurred. Because they have the same charge, they repel. ]]> 2019-04-16 19:58:58 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352121335 https://padlet.com/mrowzee/Per8PithBallLab/wish/352122639 As the pith ball and vinyl are touching the electrons are transferred by polarization because the ball is a neutral conductor so it the electrons on it can move freely and then it is negatively charged. ]]> 2019-04-16 20:01:40 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352122639 jjcarey https://padlet.com/mrowzee/Per8PithBallLab/wish/352122891 When the neutral pith ball is touching the negatively charged vinyl the pith ball becomes negative because the electrons in the vinyl are transferred onto the pith ball. ]]> 2019-04-16 20:02:43 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352122891 https://padlet.com/mrowzee/Per8PithBallLab/wish/352123804 When I touch the pith ball with my hand it is grounded so then it is neutral again and when the vinyl is close to it they are attracted again because the electrons can move freely again]]> 2019-04-16 20:05:17 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352123804 https://padlet.com/mrowzee/Per8PithBallLab/wish/352161308 Initially the vinyl and pith ball are attacted because the vinyl has a negative charge and the pith ball is neutral.]]> 2019-04-17 00:25:04 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352161308 https://padlet.com/mrowzee/Per8PithBallLab/wish/352161575 They vinyl transfers electrons to the pith ball to give it a negative charge (charged by friction). This is because of polarization and the electrons move freely through the conductor (pith ball).]]> 2019-04-17 00:27:05 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352161575 https://padlet.com/mrowzee/Per8PithBallLab/wish/352161963 The pith ball and vinyl now repel each other because they both have negative charges from polarization.]]> 2019-04-17 00:30:18 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352161963 https://padlet.com/mrowzee/Per8PithBallLab/wish/352162738 3a) The pith ball is near the vinyl which is negatively charged and is attracted initially. This is because of the previously stated charges; the negatively charged electrons transfer to the neutral pith ball forcing it to attract and then repel after transfer happens.
3b) Now as the pith ball is negatively charged after touch, because the electrons from the vinyl (insulator) can freely move on the ball (conductor).
3c) After doing this the ball and vinyl repel each other. This is because now that both have a negative charge, the same charged repel.]]> 2019-04-17 00:36:40 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352162738 https://padlet.com/mrowzee/Per8PithBallLab/wish/352173276 3a.) The vinyl is negatively charged and is near the pithball and is attracted at first and then repelled. This is because the negatively charged electrons transfer to the neutral pithball, then attracts after the transfer happens.
3b.) The pithball is neutral and is a conductor. The electrons are moving freely then once the vinyl touches the pithball, the electrons move to the opposite side allowing the ball and vinyl to stick, this is because of polarization. 
3c.) Once the pithball was polarized it allowed an object of the opposite charge to be attracted. ]]> 2019-04-17 01:48:29 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352173276 https://padlet.com/mrowzee/Per8PithBallLab/wish/352180608 3a. Initially, the vinyl and pith ball attracts. This is because the pith ball is a conductor, and naturally attracts to all magnetic fields regardless if it's negative or positive.
3b. While the pith ball is touching the vinyl, electrons are being transferred via induction from the vinyl to the pith ball, making the pith ball host a negative charge.
3c. After the vinyl strip is removed from the pith ball, now both objects repel each other. This is because the vinyl still retains its negativity, but the pith ball also hosts a negative charge. Similar charges repel.]]> 2019-04-17 02:35:33 UTC https://padlet.com/mrowzee/Per8PithBallLab/wish/352180608