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 (B)</p> Signup and view all the answers

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

<p>$9.8 m/s^2$ (A)</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>$W = F_g = mg$ (A)</p> Signup and view all the answers

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

<p>Obesity (C)</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 (A)</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 (D)</p> Signup and view all the answers

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

<p>Skeletal muscle force (A)</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 (D)</p> Signup and view all the answers

How are muscle fibers bound together to form the muscle?

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

What are muscles connected to bones by?

<p>Tendons (D)</p> Signup and view all the answers

What causes production of magnetic fields when they move?

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

What causes transmission of signals in the nervous system?

<p>Electric charges (C)</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>$W = mg$ (C)</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 (C)</p> Signup and view all the answers

What causes production of magnetic fields when they move?

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

What are muscles connected to bones by?

<p>Tendons (C)</p> Signup and view all the answers

What causes transmission of signals in the nervous system?

<p>Neurotransmitters (B)</p> Signup and view all the answers

Which force acts only within extremely small distances between nucleons?

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

What is the diameter range of skeletal muscle fibers?

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

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

<p>Electric forces (C)</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>$10^{39}:1$ (C)</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 (D)</p> Signup and view all the answers

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