Forces in the Human Body
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Questions and Answers

What is the role of synovial fluid in the joint?

  • To act as a lubricant and reduce friction (correct)
  • To increase the friction between the joints
  • To provide a torque on the joint
  • To provide a normal force on the joint

    • What is the force of friction dependent on?

  • Both the coefficient of friction and the normal force (correct)
  • Neither the coefficient of friction nor the normal force
  • Only the coefficient of friction
  • Only the normal force

    • What is the formula for the force of friction?

  • Ff = mg
  • Ff = ma
  • Ff = μN (correct)
  • Ff = μv

    • What is the coefficient of friction between two ice surfaces in the given example?

    <p>0.05</p> Signup and view all the answers

    What is the force of friction acting on the block of ice in the given example?

    <p>147 N</p> Signup and view all the answers

    What is the formula for the normal force on an object on a flat surface?

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

    What is the Newton's second law of motion?

    <p>F = ma</p> Signup and view all the answers

    What is the net force acting on the block of mass 2 kg in the example?

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

    What is the acceleration of the block of mass 2 kg in the example?

    <p>-5 m/s2</p> Signup and view all the answers

    What is one of the effects of acceleration on the body?

    <p>Apparent increase or decrease in body weight</p> Signup and view all the answers

    What happens if the acceleration becomes large?

    <p>Blood flow to the brain decreases</p> Signup and view all the answers

    What can happen to tissues if the forces are large?

    <p>They can be distorted, torn or ruptured</p> Signup and view all the answers

    What is the resonant frequency of an organ dependent on?

    <p>Its mass and elastic forces</p> Signup and view all the answers

    What happens if an organ is vibrated vigorously at its resonant frequency?

    <p>Pain or discomfort occurs</p> Signup and view all the answers

    What is the rankings of the four fundamental forces from weakest to strongest?

    <p>Gravitational force, Electrical force, Weak nuclear force, Strong nuclear force</p> Signup and view all the answers

    Which forces are of importance in the study of forces affecting the human body?

    <p>Gravitational and electrical forces</p> Signup and view all the answers

    What is the role of electrical forces in the human body?

    <p>Affecting the binding together of bones and controlling the contraction of muscles</p> Signup and view all the answers

    How does the gravitational force affect the blood flow in the body?

    <p>It causes the venous blood to travel against its force on its way to the heart</p> Signup and view all the answers

    What is the role of frictional forces in the human body?

    <p>It causes energy loss and appears in everyday life</p> Signup and view all the answers

    What is the role of calcium in the bone formation?

    <p>It becomes part of the bone crystal if it gets close to a natural place for calcium and electrical forces are great enough to trap it</p> Signup and view all the answers

    What is the muscular force responsible for in the body?

    <p>Causing the blood to circulate and the lungs to take in air</p> Signup and view all the answers

    What is the main factor that determines the speed at which small objects fall through a liquid?

    <p>Size of the object</p> Signup and view all the answers

    What happens to the effective radius of red blood cells in some forms of disease such as rheumatic heart disease?

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

    What is the relationship between the retarding force Fd and terminal velocity V for a spherical object?

    <p>Fd = 6πηaV</p> Signup and view all the answers

    What is the purpose of using a centrifuge in dynamics?

    <p>To increase the acceleration due to gravity</p> Signup and view all the answers

    What is the density of the solution in which sedimentation of small spherical objects occurs?

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

    What is the unit of measurement for the acceleration due to gravity?

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

    What is the symbol for the viscosity of the liquid in Stokes' equation?

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

    What is the result of an increased sedimentation velocity in some forms of disease?

    <p>Red blood cells clump together</p> Signup and view all the answers

    What is the term for the tendency of suspended solids of different densities to separate when accelerated?

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

    The sedimentation velocity of small spherical objects increases when their effective radius decreases.

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

    Centrifuges can be used to decrease the acceleration due to gravity.

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

    The retarding force Fd is directly proportional to the terminal velocity V.

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

    The viscosity of a liquid has no effect on the sedimentation velocity of small objects.

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

    The density of the solution has no effect on the sedimentation of small spherical objects.

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

    The sedimentation velocity of small objects is independent of their size.

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

    The acceleration due to gravity is the only factor affecting the sedimentation velocity of small objects.

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

    The tendency of suspended solids of different densities to separate when accelerated is known as dynamics.

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

    The radius of the spherical object has no effect on the retarding force Fd.

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

    The terminal velocity V is inversely proportional to the radius of the spherical object.

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

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