Gr 9 NATURAL SCIENCES: CH 3.1 Field (non-contact) forces
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Questions and Answers

What type of forces act over a distance without direct physical contact between objects?

  • Frictional forces
  • Field forces (correct)
  • Tension forces
  • Contact forces

    • What is the gravitational force between two objects dependent on?

  • Only mass of the objects
  • Only distance between the objects
  • Shape of the objects
  • Mass of the objects and the distance between them (correct)

    • What is the formula to calculate weight (W)?

  • W = m × g (correct)
  • W = g / m
  • W = m + g
  • W = m / g

    • What type of materials are magnetic?

    <p>Only certain materials like iron, nickel, and cobalt</p> Signup and view all the answers

    What happens when two magnets with the same poles are brought close together?

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

    What is a common example of the gravitational force?

    <p>Dropping an object</p> Signup and view all the answers

    What is the direction of the gravitational field of the Earth?

    <p>Inwards towards the center of the Earth</p> Signup and view all the answers

    What can be used to visualize magnetic fields?

    <p>Iron filings or field lines</p> Signup and view all the answers

    What is an example of magnetic forces in action?

    <p>A bar magnet attracting iron filings</p> Signup and view all the answers

    What are the two poles of a magnet?

    <p>North and south</p> Signup and view all the answers

    What is the direction of magnetic field lines around a bar magnet?

    <p>From the north pole to the south pole</p> Signup and view all the answers

    What happens to objects with like charges?

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

    What is the nature of gravitational force?

    <p>Always attractive and depends on mass and distance</p> Signup and view all the answers

    How can electrostatic forces be demonstrated?

    <p>By observing the behavior of charged objects</p> Signup and view all the answers

    What is common among all three field forces?

    <p>They all act over a distance without physical contact</p> Signup and view all the answers

    What is the purpose of a compass?

    <p>To show the direction of magnetic fields</p> Signup and view all the answers

    What is the result of friction causing electrons to transfer between objects?

    <p>One object becomes positively charged and the other becomes negatively charged</p> Signup and view all the answers

    What is an application of magnetic force?

    <p>Used in electric motors and MRI machines</p> Signup and view all the answers

    What is an example of electrostatic force in nature?

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

    How are gravitational fields typically represented?

    <p>With arrows pointing towards the center of the attracting mass</p> Signup and view all the answers

    What is the primary reason why objects fall towards the ground?

    <p>Because of the gravitational force of the Earth</p> Signup and view all the answers

    Which of the following is NOT a characteristic of gravitational force?

    <p>It is a contact force</p> Signup and view all the answers

    What is the direction of magnetic field lines around a bar magnet?

    <p>Aligned perpendicular to the length of the magnet</p> Signup and view all the answers

    What is true about the magnetic forces between two magnets?

    <p>Like poles always repel, and opposite poles always attract</p> Signup and view all the answers

    What is the primary difference between gravitational force and magnetic force?

    <p>Gravitational force is related to mass, while magnetic force is related to magnetism</p> Signup and view all the answers

    What is the result of the gravitational force between two objects?

    <p>The objects attract each other</p> Signup and view all the answers

    Which of the following is an example of a field force?

    <p>The force of attraction between two magnets</p> Signup and view all the answers

    What is true about the gravitational force between the Earth and an object on its surface?

    <p>It is an attractive force</p> Signup and view all the answers

    What is a common characteristic of field forces?

    <p>They act over a long distance without physical contact</p> Signup and view all the answers

    What is the purpose of visualizing magnetic fields?

    <p>To understand the pattern of magnetic forces</p> Signup and view all the answers

    What is the main difference between electrostatic forces and magnetic forces?

    <p>Electrostatic forces act between charged objects, while magnetic forces act between magnetic poles.</p> Signup and view all the answers

    What is the purpose of representing field forces with fields and field lines?

    <p>To show the direction of the force and its strength.</p> Signup and view all the answers

    What is a real-world application of magnetic force?

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

    What is the nature of electrostatic forces between opposite charges?

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

    Which of the following is NOT a way to visualize electrostatic fields?

    <p>Iron filings</p> Signup and view all the answers

    What is the result of friction causing electrons to transfer between objects?

    <p>One object becomes positively charged, and the other becomes negatively charged.</p> Signup and view all the answers

    Which of the following is a similarity between gravitational, magnetic, and electrostatic forces?

    <p>They act over a distance without physical contact.</p> Signup and view all the answers

    What is a common example of electrostatic forces in nature?

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

    What is the direction of magnetic field lines around a bar magnet?

    <p>From north pole to south pole</p> Signup and view all the answers

    What is used to demonstrate the behavior of charged objects in electrostatic fields?

    <p>Balloon and hair</p> Signup and view all the answers

    What is the primary difference between the gravitational force and the magnetic force?

    <p>The gravitational force acts between objects with mass, while the magnetic force acts between objects with charge.</p> Signup and view all the answers

    What is the direction of the magnetic field lines around a bar magnet?

    <p>Perpendicular to the surface of the magnet</p> Signup and view all the answers

    What is true about the gravitational force between two objects?

    <p>It is always attractive</p> Signup and view all the answers

    What is the purpose of visualizing magnetic fields?

    <p>To visualize the direction of magnetic field lines</p> Signup and view all the answers

    What is true about electrostatic forces between opposite charges?

    <p>They are always attractive</p> Signup and view all the answers

    What is the result of the gravitational force between two objects?

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

    What is the nature of magnetic forces?

    <p>Like poles repel, and opposite poles attract</p> Signup and view all the answers

    What is an application of magnetic force?

    <p>Generating electricity</p> Signup and view all the answers

    What is common among all three field forces?

    <p>They are all non-contact forces</p> Signup and view all the answers

    What is the primary reason why objects fall towards the ground?

    <p>Due to gravity</p> Signup and view all the answers

    What is the primary reason why like charges repel each other?

    <p>Because they have the same type of charge</p> Signup and view all the answers

    What is a common characteristic of magnetic fields and electrostatic fields?

    <p>They can be represented by fields and field lines</p> Signup and view all the answers

    What is the primary difference between the gravitational force and the magnetic force?

    <p>Gravitational force is dependent on mass, while magnetic force is dependent on charge</p> Signup and view all the answers

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

    <p>The objects attract each other</p> Signup and view all the answers

    What is a common application of magnetic forces?

    <p>Generating electricity</p> Signup and view all the answers

    What is the direction of the magnetic field lines around a bar magnet?

    <p>From the north pole to the south pole</p> Signup and view all the answers

    What is the primary reason why objects with opposite charges attract each other?

    <p>Because they have opposite charges</p> Signup and view all the answers

    What is a common characteristic of all three field forces?

    <p>They can be represented by fields and field lines</p> Signup and view all the answers

    What is the result of the magnetic force between two magnets with opposite poles?

    <p>The magnets attract each other</p> Signup and view all the answers

    What is the primary difference between the magnetic force and the electrostatic force?

    <p>Magnetic force is dependent on poles, while electrostatic force is dependent on charge</p> Signup and view all the answers

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