In the classroom activity, you were able to make the plastic float above the balloon because........ aThe charge on the plastic was negative and the charge on the balloon was positive. bThe charge on the plastic was positive and the charge on the balloon was negative. cThe charge on the plastic and balloon were both negative. dThe charge on the plastic and balloon were both positive.

When you bring a  negatively charged balloon near a neutral wall, the electrons on the balloon  repel the negative charges on the wall, making that part of the wall  negative.Word Bank:negativelyattractrepelpositivelynegativepositive

1. Cheng rubs a balloon on a wool sweater and then holds it next to another balloon. The other balloon moves away from the balloon he is holding. What hypothesis might Cheng be testing? aHow much electric charge can a balloon hold?bCan electric charge be transferred from one balloon to another?cWhere does electric charge go when it is transferred out of a wool sweater?dWhat happens when a charged balloon is placed near another charged balloon?2. A scientist is working with a pith ball that has a small negative charge. This would cause it to be MOST strongly attracted to which object? aa balloon with a large positive charge that is 5 cm awayba balloon with a large negative charge that is 5 cm awayca balloon with a large positive charge that is 50 cm awayda balloon with a large negative charge that is 50 cm away

A neutrally charged plastic pen was rubbed against a silk cloth making the plastic pen a negatively charged object after the charging process. Why does the plastic pen becomes negatively charged?Group of answer choicesElectrons from the plastic pen were transferred towards the silk cloth.Neutrons from the silk cloth were transferred towards the plastic pen.Electrons from the silk cloth were transferred towards the plastic pen.Protons from the silk cloth were transferred towards the plastic pen.

A polythene ruler and a cotton cloth are electrically neutral.  When the ruler is rubbed with the cloth, the ruler becomes negatively charged.  Why does this happen?Protons (positive charges) are transferred from the ruler to the clothElectrons (negative charges) are transferred from the ruler to the clothProtons (positive charges) are transferred from the cloth to the rulerElectrons (negative charges) are transferred from the cloth to the ruler2Which of the following is NOT due to static electricity?A lightning strikeA bulb lighting up when connected to an electric circuitA balloon being attracted to a wallA ruler being used to pick up pieces of paper3When a positively charged rubber balloon is placed in contact with a neutral wall, it appears to ‘stick’ to the wall.  Which of the following best explains why this happens?Electrons (negative charges) in the wall are attracted towards the balloonProtons (positive charges) in the wall are repelled away from the balloonProtons (positive charges) in the wall are attracted towards the balloonElectrons (negative charges) in the wall are repelled away from the balloon4Which of the following CANNOT be easily be charged by friction?A piece of paperA sheet of aluminium foilThe rubber sole of a shoeSome plastic cling film5Which of the following atoms is NOT electrically neutral?One which contains 2 protons, 2 neutrons and 1 electronOne which contains 2 protons, 2 neutrons and 2 electronsOne which contains 1 proton and 1 electronOne which contains 3 protons, 4 neutrons and 3 electrons

Students P and Q in a class mention an example of the application of buoyancy.Student P – Floating a balloon in the air.Student Q – Floating of a ship on a water body.Which of the students is correct?