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

What is the Newton's second law of motion?

<p>F = ma (A)</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 (C)</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 (A)</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 (A)</p> Signup and view all the answers

What happens if the acceleration becomes large?

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

What is the resonant frequency of an organ dependent on?

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

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

<p>Pain or discomfort occurs (A)</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 (D)</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 (C)</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 (B)</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 (B)</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 (A)</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 (D)</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 (D)</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 (B)</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 (D)</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 (D)</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 (C)</p> Signup and view all the answers

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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