Forces and Friction in Physics
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Questions and Answers

What is the net force acting on an object when static friction prevents it from moving?

  • The net force is equal to the force of friction.
  • The net force is equal to the mass of the object.
  • The net force is equal to zero. (correct)
  • The net force is equal to the applied force.

    • Which of the following forces is an example of a non-contact force?

  • The force of a book resting on a table
  • The force of a hammer hitting a nail.
  • The force of a person pushing a shopping cart
  • The force of a magnet attracting a paperclip (correct)

    • What is the relationship between the mass of an object and the gravitational force it experiences?

  • The more massive an object is, the less gravitational force it experiences.
  • The more massive an object is, the more gravitational force it experiences. (correct)
  • The mass of an object has no effect on the gravitational force it experiences.
  • The relationship between mass and gravitational force is unpredictable.

    • How does distance affect the gravitational force between two objects?

    <p>The farther apart the objects are, the weaker the gravitational force. (D)</p> Signup and view all the answers

    What type of friction occurs when a car's brakes are applied?

    <p>Sliding friction (A)</p> Signup and view all the answers

    What is the difference between weight and mass?

    <p>Weight is a force and mass is the amount of matter in an object. (B)</p> Signup and view all the answers

    Which of the following is NOT an example of fluid friction?

    <p>A ball rolling down a hill (D)</p> Signup and view all the answers

    Which of the following is an example of static friction?

    <p>A person walking on a sidewalk (D)</p> Signup and view all the answers

    How can friction be reduced?

    <p>By decreasing the surface area of contact. (B)</p> Signup and view all the answers

    What happens to the motion of an object when a force is applied to it?

    <p>The object's motion will change, either by speeding up, slowing down, or changing direction. (C)</p> Signup and view all the answers

    Flashcards

    Force

    A push or a pull on an object, measured in newtons (N).

    Contact Force

    A push or pull on one object by another that is touching it.

    Non-Contact Force

    A push or pull on one object by another without touching.

    Friction

    A force that resists the motion of two objects that are touching.

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    Static Friction

    A type of friction that prevents objects from sliding past each other.

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    Sliding Friction

    Friction that opposes the motion of objects sliding past each other.

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    Fluid Friction

    Friction between a surface and a fluid such as water or air.

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    Gravity

    An attractive force that exists between all objects that have mass.

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    Weight

    The amount of gravitational force exerted on an object, measured in newtons (N).

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    Law of Universal Gravitation

    States that the gravitational force increases with mass and decreases with distance.

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    Study Notes

    Forces

    • Forces are pushes or pulls on objects
    • Forces are measured in newtons (N)
    • Two types of forces: contact and non-contact.

    Contact Forces

    • Example: pushing a container, pressing computer keys or friction.

    Non-Contact Forces

    • Example: gravity, magnetic, and electric forces.

    Types of Friction

    • Friction: a force that resists motion of two objects touching.
    • Static friction: prevents objects from sliding past each other
    • Sliding friction: opposes the motion of objects sliding past each other
    • Fluid friction: friction between a surface and a fluid such as water or air (air resistance)

    Static Friction vs. Sliding Friction

    • Static friction: prevents motion between two objects, Net Force = 0 N.
    • Sliding friction: opposes motion that is already happening, Net Force >/= 0 N.

    Gravity

    • Gravity: an attractive force between all objects with mass.
    • Mass: the amount of matter in an object.
    • The more mass, the more gravitational pull.
    • The greater the distance, the less gravitational pull.

    Weight vs. Mass

    • Weight: the amount of gravitational force exerted on an object (measured in Newtons).
    • Weight depends on gravity and Mass.
    • Mass does not change, weight changes with depending on location (gravity).

    Electric Force

    • Static charge: unbalanced positive or negative charge on an object.
    • Opposite charges attract, and the same charges repel.
    • Strength of electric forces depends on amount of charge and the distance between the objects.

    Magnetic Force

    • Magnet: object that attracts iron.
    • Magnetic poles: the place on a magnet with the strongest force.
    • Opposite poles attract, and the same poles repel.
    • Magnet strength is influenced by magnet size and distance, farther away the magnets are the weaker the magnetic force becomes.

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    Related Documents

    Forces Teacher Notes PDF

    Description

    This quiz covers the fundamental concepts of forces, including contact and non-contact forces, as well as different types of friction. It explores the relationship between mass and gravitational pull, and distinguishes between static and sliding friction. Test your understanding of these crucial physical principles!

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