Master the Basics of Forces
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Questions and Answers

Why does it feel like the person is floating when they have stopped accelerating?

  • Because they have reached the maximum height
  • Because they are no longer being pulled by gravity
  • Because their velocity is steady and there is no net force on them (correct)
  • Because their parachutes have increased drag

    • What happens when the person pulls their cords to open their parachutes?

  • Velocity levels off
  • Gravity increases
  • The net force becomes zero
  • Drag increases and there is an unbalanced force upward (correct)

    • What is the relationship between drag and velocity according to the text?

  • As velocity increases, drag increases (correct)
  • As velocity decreases, drag increases
  • As velocity increases, drag decreases
  • As velocity decreases, drag decreases

    • What happens when the forces of acceleration and drag fall into balance?

    <p>The net force becomes zero and the person stops accelerating</p> Signup and view all the answers

    What is the main reason why the person in the text feels like they are floating?

    <p>Because their velocity is steady and there is no net force on them</p> Signup and view all the answers

    What is a force?

    <p>An invisible push or pull on an object</p> Signup and view all the answers

    What is the unit used to measure force?

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

    What is an unbalanced force?

    <p>A push or pull where the net force is not zero</p> Signup and view all the answers

    What is the difference between magnitude and direction of a force?

    <p>Magnitude is the size of the force, and direction is the way the force is acting</p> Signup and view all the answers

    What happens when two forces push in opposite directions with the same magnitude?

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

    Which of the following best describes the force of drag?

    <p>The force of air molecules resisting motion through the air</p> Signup and view all the answers

    What is the net force on the plane while it is flying straight and level?

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

    What is the difference between acceleration and velocity in physics?

    <p>Acceleration refers to any change in velocity, while velocity refers to speed and direction of motion</p> Signup and view all the answers

    What is the difference between contact and non-contact forces?

    <p>Contact forces are between objects that are touching, while non-contact forces can affect objects that are separated</p> Signup and view all the answers

    What is the main force that must be overcome in order for a plane to take off?

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

    What is a force?

    <p>A vector quantity with magnitude and direction</p> Signup and view all the answers

    What is the unit used to measure force?

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

    What is an unbalanced force?

    <p>A force that is not equal in magnitude and direction</p> Signup and view all the answers

    What is the difference between speed and velocity?

    <p>Speed is a scalar quantity, while velocity is a vector quantity</p> Signup and view all the answers

    What is the net force when two forces push in opposite directions with different magnitudes?

    <p>The net force is equal to the difference between the magnitudes of the two forces</p> Signup and view all the answers

    What happens to drag as velocity increases?

    <p>Drag increases</p> Signup and view all the answers

    What happens when the forces of drag and gravity are balanced?

    <p>The person stops accelerating</p> Signup and view all the answers

    What causes a sudden, unbalanced force upward when the person pulls their cords?

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

    What happens when the person's velocity is steady?

    <p>The net force on the person is zero</p> Signup and view all the answers

    What is the relationship between drag and acceleration according to the text?

    <p>Drag and acceleration are inversely proportional</p> Signup and view all the answers

    What are the three main forces accounting for the movement of the plane?

    <p>Friction, drag, and gravity</p> Signup and view all the answers

    What is the net force on the plane while it is flying straight and level?

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

    What is the difference between acceleration and velocity in physics?

    <p>Velocity is the speed of an object in a straight line, while acceleration is any change in velocity, including speed, ups, slowdowns, and turns</p> Signup and view all the answers

    What is the main reason why a plane needs to generate enough upward force to overcome gravity?

    <p>To get the plane off the ground</p> Signup and view all the answers

    What is the difference between contact and non-contact forces?

    <p>Contact forces are between objects that are touching, while non-contact forces are between objects that are not touching</p> Signup and view all the answers

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