Physics: Dynamics of the Body 3.1 Forces Quiz
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Questions and Answers

Which force is referred to as the force of gravitation on an object near the surface of a celestial body?

  • Electrical force
  • Nuclear force
  • Frictional force
  • Gravitational force (correct)

    • What is the unit of measuring force?

  • Dyne
  • Newton (correct)
  • Joule
  • Pascal

    • What is the measure of the gravitational force on an object near the surface of the earth?

  • $F_g = mg$ (correct)
  • $F_g = m + g$
  • $F_g = m/g$
  • $F_g = m - g$

    • What important medical effect does gravity have on the body according to the text?

    <p>Development of varicose veins</p> Signup and view all the answers

    What is the value of the gravity constant (g) near the surface of the earth?

    <p>$9.8 m/s^2$</p> Signup and view all the answers

    What is the measure of weight (W) in terms of mass (m) and gravity constant (g) according to the text?

    <p>$W = F_g = mg$</p> Signup and view all the answers

    What could cause failure of the one way valves in the venous system?

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

    In a weightless region, what can happen to a person's bone minerals?

    <p>They will lose some of their bone minerals</p> Signup and view all the answers

    Which force is significantly greater than the gravitational force between an electron and a proton in a hydrogen atom?

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

    What is responsible for supporting and moving the skeleton by contraction?

    <p>Skeletal muscle force</p> Signup and view all the answers

    What is the function of the nuclear force?

    <p>Holds protons and neutrons together in the nucleus of the atom</p> Signup and view all the answers

    How are muscle fibers bound together to form the muscle?

    <p>By connective tissue</p> Signup and view all the answers

    What are muscles connected to bones by?

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

    What causes production of magnetic fields when they move?

    <p>Electric charges</p> Signup and view all the answers

    What causes transmission of signals in the nervous system?

    <p>Electric charges</p> Signup and view all the answers

    What is the measure of weight (W) in terms of mass (m) and gravity constant (g) according to the text?

    <p>$W = mg$</p> Signup and view all the answers

    What important medical effect does gravity have on the body according to the text?

    <p>Enlargement of veins leading to varicose formation</p> Signup and view all the answers

    What causes production of magnetic fields when they move?

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

    What are muscles connected to bones by?

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

    What causes transmission of signals in the nervous system?

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

    Which force acts only within extremely small distances between nucleons?

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

    What is the diameter range of skeletal muscle fibers?

    <p>10-100μm</p> Signup and view all the answers

    What causes the production of magnetic fields when electric charges move?

    <p>Electric forces</p> Signup and view all the answers

    What is the approximate ratio of the electrical force to the gravitational force between an electron and a proton in a hydrogen atom?

    <p>$10^{39}:1$</p> Signup and view all the answers

    What can cause failure of the one way valves in the venous system according to the text?

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

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