Physics: Equilibrium of Forces on a Plank
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Questions and Answers

What is the unit of velocity measurement?

  • m/s^2
  • km/h
  • m/s (correct)
  • cm/min

    • What is the confidence probability (P) for the given confidence interval of systematic error?

  • 0.99
  • 0.95 (correct)
  • 0.80
  • 0.90

    • What is the branch of physics that deals with the motion of material objects and their interaction?

  • Thermodynamics
  • Optics
  • Mechanics (correct)
  • Electromagnetism

    • What is the average velocity of a particle defined as?

    <p>The ratio of its displacement to the time interval</p> Signup and view all the answers

    What is the difference between direct and indirect measurements?

    <p>Direct measurements involve the use of instruments, while indirect measurements involve the use of calculations</p> Signup and view all the answers

    What is the confidence interval of systematic error (∆с) in the given problem?

    <p>1</p> Signup and view all the answers

    What is the product of the force and its perpendicular distance from the fulcrum called?

    <p>Moment of the force</p> Signup and view all the answers

    What is the condition for the plank to be in equilibrium?

    <p>Fl1 = Pl2</p> Signup and view all the answers

    What is the ratio of Pl2 to F known as?

    <p>Mechanical advantage</p> Signup and view all the answers

    What is the angle of the biceps muscle to the elbow in the example problem?

    <p>12°</p> Signup and view all the answers

    What is the force exerted by the biceps muscle in the example problem?

    <p>30.7 N</p> Signup and view all the answers

    What type of muscle is the biceps in the example problem?

    <p>Flexor muscle</p> Signup and view all the answers

    What is the tendency of a force to rotate a rigid body about an axis measured by?

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

    What is the formula for calculating the magnitude of the torque?

    <p>τ = rFsinθ</p> Signup and view all the answers

    What is the direction of the torque vector?

    <p>The direction of a right-handed screw rotated in the direction θ</p> Signup and view all the answers

    What is the lever arm of a force?

    <p>The perpendicular distance from the rotation axis to the line of action of the force</p> Signup and view all the answers

    What is the condition for static equilibrium in terms of torque?

    <p>The sum of all torques equals zero</p> Signup and view all the answers

    What is the purpose of a lever?

    <p>To balance a larger force by a lesser one</p> Signup and view all the answers

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