Gr 8 Natural Sciences Ch 3.1: Friction and static electricity
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Questions and Answers

What happens when you rub a balloon on your hair?

  • Electrons transfer from the balloon to your hair, making your hair negatively charged
  • Electrons transfer from the ground to the balloon, making your hair charged
  • Electrons transfer from your hair to the balloon, making your hair positively charged (correct)
  • Electrons transfer from the air to the balloon, making your hair neutral

    • What is the purpose of earthing an object?

  • To generate a large electric charge
  • To create a spark
  • To attract charged particles from the air
  • To safely discharge extra electrons into the Earth (correct)

    • What occurs during thunderstorms that leads to lightning?

  • Friction between particles in clouds causes a decrease in charge
  • Friction between particles in clouds causes a build-up of charge (correct)
  • Friction between particles in the Earth causes a build-up of charge
  • Friction between particles in the air causes a decrease in charge

    • What is the function of an electroscope?

    <p>To detect the presence and type of charge on an object</p> Signup and view all the answers

    What is the result of a significant build-up of charge on an object?

    <p>A discharge, either through contact or across an air gap</p> Signup and view all the answers

    What is the purpose of a Van de Graaff Generator?

    <p>To generate a large electric charge on a metal dome</p> Signup and view all the answers

    What is the main cause of static electricity?

    <p>The movement of electrons</p> Signup and view all the answers

    What is the charge of electrons?

    <p>Negative</p> Signup and view all the answers

    What happens to an object when it loses electrons?

    <p>It becomes positively charged</p> Signup and view all the answers

    What is the result of friction between two surfaces?

    <p>Electrons are transferred from one surface to another</p> Signup and view all the answers

    What is the normal state of an object in terms of charge?

    <p>Neutral</p> Signup and view all the answers

    What happens when two objects with the same charge interact?

    <p>They repel each other</p> Signup and view all the answers

    What is the nucleus of an atom mainly composed of?

    <p>Protons and neutrons</p> Signup and view all the answers

    What is the result of combing your hair with a plastic comb?

    <p>Your hair stands on end and produces crackling sounds</p> Signup and view all the answers

    Why do sparks occur when there is a significant build-up of charge on an object?

    <p>Because the charge difference becomes large enough to cause a discharge</p> Signup and view all the answers

    What happens to the excess charge when an object is earthed?

    <p>It dissipates safely into the Earth</p> Signup and view all the answers

    What is the purpose of a Van de Graaff Generator?

    <p>To generate a large electric charge on a metal dome</p> Signup and view all the answers

    What is the effect of a charged object on the gold foil strips in an electroscope?

    <p>They spread apart when a charged object is brought near</p> Signup and view all the answers

    What is the difference between a spark and a lightning flash?

    <p>A spark occurs between two objects, while a lightning flash occurs between clouds and the Earth</p> Signup and view all the answers

    What is the result of a charged object coming into contact with a conductor?

    <p>The charged object discharges its excess charge</p> Signup and view all the answers

    What is the primary reason why objects become charged?

    <p>Due to the transfer of electrons</p> Signup and view all the answers

    What happens when an object has more protons than electrons?

    <p>It becomes positively charged</p> Signup and view all the answers

    What is the result of friction between two surfaces?

    <p>Electrons are transferred from one surface to another</p> Signup and view all the answers

    Why do objects with opposite charges attract each other?

    <p>Because of the difference in their charge</p> Signup and view all the answers

    What is the term for the resistance against the movement of an object resulting from its contact with another object?

    <p>Friction</p> Signup and view all the answers

    What happens to an object when it gains electrons?

    <p>It becomes negatively charged</p> Signup and view all the answers

    Why do objects with the same charge repel each other?

    <p>Because of the difference in their charge</p> Signup and view all the answers

    What is the composition of the nucleus of an atom?

    <p>Protons and neutrons</p> Signup and view all the answers

    What is the primary cause of static electricity effects?

    <p>The transfer of electrons between objects</p> Signup and view all the answers

    What happens to an atom when it gains electrons?

    <p>It becomes negatively charged</p> Signup and view all the answers

    Why do objects with opposite charges attract each other?

    <p>Because opposite charges are attracted to each other</p> Signup and view all the answers

    What is the result of friction between two surfaces?

    <p>Electrons are transferred between the surfaces</p> Signup and view all the answers

    What is the normal state of an object in terms of charge?

    <p>Neutral</p> Signup and view all the answers

    What is the term for the resistance against the movement of an object resulting from its contact with another object?

    <p>Friction</p> Signup and view all the answers

    What happens when two objects with the same charge interact?

    <p>They repel each other</p> Signup and view all the answers

    What is the composition of the nucleus of an atom?

    <p>Protons and neutrons</p> Signup and view all the answers

    What is the direction of electron transfer when a balloon is rubbed on hair?

    <p>From the hair to the balloon</p> Signup and view all the answers

    What can occur when a charged object comes into contact with a metal object?

    <p>A spark and a shock</p> Signup and view all the answers

    What is the purpose of an electroscope?

    <p>To detect the presence and type of charge on an object</p> Signup and view all the answers

    What occurs when the charge difference between charged regions becomes large enough?

    <p>A lightning flash occurs</p> Signup and view all the answers

    What is the result of a charged object being brought near the gold foil strips in an electroscope?

    <p>The strips spread apart</p> Signup and view all the answers

    What is the purpose of earthing an object?

    <p>To safely discharge excess electrons</p> Signup and view all the answers

    What is the primary mechanism by which a balloon becomes negatively charged when rubbed on hair?

    <p>Electrons transfer from the hair to the balloon</p> Signup and view all the answers

    What is the primary reason why sparks can ignite flammable materials?

    <p>The sparks produce a high-voltage electrical discharge</p> Signup and view all the answers

    What is the primary function of an electroscope in detecting static electricity?

    <p>To detect the presence of a charged object</p> Signup and view all the answers

    What is the primary effect of earthing an object on the object's charge?

    <p>The object's charge becomes neutral</p> Signup and view all the answers

    What is the primary mechanism by which lightning occurs during thunderstorms?

    <p>Friction between particles within clouds</p> Signup and view all the answers

    What is the primary effect of a charged object on the gold foil strips in an electroscope?

    <p>The strips become charged and spread apart</p> Signup and view all the answers

    What is the primary reason for the transfer of electrons during friction?

    <p>The objects have a difference in electron density.</p> Signup and view all the answers

    What happens to the charge of an object when it gains more electrons than it loses?

    <p>The object becomes negatively charged.</p> Signup and view all the answers

    What is the result of the interaction between two objects with opposite charges?

    <p>They attract each other.</p> Signup and view all the answers

    What is the term for the force that holds the nucleus of an atom together?

    <p>Strong nuclear force.</p> Signup and view all the answers

    What is the effect of friction on the movement of electrons between two surfaces?

    <p>It increases the movement of electrons.</p> Signup and view all the answers

    What happens to the charge of an object when it loses more electrons than it gains?

    <p>The object becomes positively charged.</p> Signup and view all the answers

    What is the result of the interaction between two objects with the same charge?

    <p>They repel each other.</p> Signup and view all the answers

    What is the term for the movement of electrons between two surfaces in contact?

    <p>Electron transfer.</p> Signup and view all the answers

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