40 Questions
What is the role of synovial fluid in the joint?
To act as a lubricant and reduce friction
What is the force of friction dependent on?
Both the coefficient of friction and the normal force
What is the formula for the force of friction?
Ff = μN
What is the coefficient of friction between two ice surfaces in the given example?
0.05
What is the force of friction acting on the block of ice in the given example?
147 N
What is the formula for the normal force on an object on a flat surface?
N = mg
What is the Newton's second law of motion?
F = ma
What is the net force acting on the block of mass 2 kg in the example?
-10 N
What is the acceleration of the block of mass 2 kg in the example?
-5 m/s2
What is one of the effects of acceleration on the body?
Apparent increase or decrease in body weight
What happens if the acceleration becomes large?
Blood flow to the brain decreases
What can happen to tissues if the forces are large?
They can be distorted, torn or ruptured
What is the resonant frequency of an organ dependent on?
Its mass and elastic forces
What happens if an organ is vibrated vigorously at its resonant frequency?
Pain or discomfort occurs
What is the rankings of the four fundamental forces from weakest to strongest?
Gravitational force, Electrical force, Weak nuclear force, Strong nuclear force
Which forces are of importance in the study of forces affecting the human body?
Gravitational and electrical forces
What is the role of electrical forces in the human body?
Affecting the binding together of bones and controlling the contraction of muscles
How does the gravitational force affect the blood flow in the body?
It causes the venous blood to travel against its force on its way to the heart
What is the role of frictional forces in the human body?
It causes energy loss and appears in everyday life
What is the role of calcium in the bone formation?
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
What is the muscular force responsible for in the body?
Causing the blood to circulate and the lungs to take in air
What is the main factor that determines the speed at which small objects fall through a liquid?
Size of the object
What happens to the effective radius of red blood cells in some forms of disease such as rheumatic heart disease?
It increases
What is the relationship between the retarding force Fd and terminal velocity V for a spherical object?
Fd = 6πηaV
What is the purpose of using a centrifuge in dynamics?
To increase the acceleration due to gravity
What is the density of the solution in which sedimentation of small spherical objects occurs?
ρo
What is the unit of measurement for the acceleration due to gravity?
m/s^2
What is the symbol for the viscosity of the liquid in Stokes' equation?
η
What is the result of an increased sedimentation velocity in some forms of disease?
Red blood cells clump together
What is the term for the tendency of suspended solids of different densities to separate when accelerated?
Dynamics
The sedimentation velocity of small spherical objects increases when their effective radius decreases.
False
Centrifuges can be used to decrease the acceleration due to gravity.
False
The retarding force Fd is directly proportional to the terminal velocity V.
True
The viscosity of a liquid has no effect on the sedimentation velocity of small objects.
False
The density of the solution has no effect on the sedimentation of small spherical objects.
False
The sedimentation velocity of small objects is independent of their size.
False
The acceleration due to gravity is the only factor affecting the sedimentation velocity of small objects.
False
The tendency of suspended solids of different densities to separate when accelerated is known as dynamics.
False
The radius of the spherical object has no effect on the retarding force Fd.
False
The terminal velocity V is inversely proportional to the radius of the spherical object.
True
Learn about the fundamental forces affecting the human body, including gravitational and electrical forces, and their importance at molecular and cellular levels. Discover how these forces impact our bodies, from bone binding to cellular control. Test your understanding of medical physics and the forces that shape our bodies.
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