Understanding Paychecks and Earnings
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Questions and Answers

What happens to the state of motion of an object when there is no net force acting on it?

  • It changes direction
  • It decelerates
  • It remains in its state of rest or motion (correct)
  • It accelerates
  • What is the net force when a 5 N force to the right and a 5 N force to the left act on an object?

  • 5 N to the right
  • 10 N to the right
  • 10 N to the left
  • 0 N (correct)
  • What is the direction of the net force when a 5 N force to the right and a 15 N force to the left act on an object?

  • Downward
  • To the left (correct)
  • Upward
  • To the right
  • What is the purpose of a free-body diagram?

    <p>To represent the forces acting on an object visually</p> Signup and view all the answers

    What is the state of an object when the net force acting on it is zero?

    <p>In equilibrium</p> Signup and view all the answers

    What is the net force when a 600 N force downward and a 200 N force upward act on an object?

    <p>400 N downward</p> Signup and view all the answers

    What is important to include in a free-body diagram?

    <p>The magnitude and direction of each force, labeled</p> Signup and view all the answers

    What happens to an object when there is a net force greater than zero acting on it?

    <p>It accelerates or decelerates</p> Signup and view all the answers

    What is the term for the total amount of money you earn in a year?

    <p>Gross amount</p> Signup and view all the answers

    What is the difference between gross and net amounts?

    <p>Gross amount is the amount after deductions, while net amount is the total amount</p> Signup and view all the answers

    What is the vector sum of all forces acting on an object?

    <p>Net force</p> Signup and view all the answers

    Why can't we simply add up forces to get a total amount?

    <p>Because forces are vector quantities with both magnitude and direction</p> Signup and view all the answers

    How do we represent vectors, like forces, graphically?

    <p>With arrows</p> Signup and view all the answers

    What is the unit of measurement for forces, mentioned in the passage?

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

    What is similar to calculating net force, according to the passage?

    <p>Adding positive and negative numbers</p> Signup and view all the answers

    Study Notes

    Forces Are Vectors

    • Forces are vector quantities with both magnitude and direction, represented by arrows.
    • The size of the arrow indicates the relative magnitude of the force, while the direction of the arrow shows the direction the force is acting.

    Calculating Net Force

    • Net force is the vector sum of all forces acting on an object.
    • To calculate net force, find the difference between forces as you add up the vectors.
    • Forces can cancel each other out if they have the same magnitude and opposite directions.

    Examples of Net Force

    • If two forces of 5 N are acting on an object, one to the left and one to the right, the net force is zero.
    • If two forces of 5 N are acting on an object in the same direction, the net force is 10 N in that direction.
    • If forces of 5 N to the right and 15 N to the left are acting on an object, the net force is 10 N to the left.

    Net Force and State of Motion

    • Newton's first law states that an object continues in its state of rest or motion unless acted on by an outside unbalanced force.
    • Forces are unbalanced when there is a net force greater than zero.
    • When there is no net force, the forces are balanced, and the object is in equilibrium.

    Free-Body Diagrams

    • Free-body diagrams are visual representations of the forces acting on an object.
    • Vectors in free-body diagrams represent forces, with the size of the arrow indicating magnitude and the direction indicating direction.
    • The object is represented by a box, and the forces acting on the object come out from its sides.
    • Labels should be included in free-body diagrams to identify the forces and their magnitudes.

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