MODULE 3 Flashcards
Basic mechanics
static forces, dynamic forces and all types of motion
physiological and anatomical biophysics include
Basic Mechanics, Fluid Dynamics, Acoustics and Optics, Heat and Energy, Materials Strengths and Elasticity
mechnaics in physics means
application of forces to physical objects
branch of biophysics that deals with the application of forces to biological objects
BIOMECHANICS
It is the mechanics of a living body especially of the forces exerted by muscles and gravity on the skeletal structure.
BIOMECHANICS
Biomechanics includes studying
a. THE MOTION OF ANIMALS
b. THE MECHANICS OF VARIOUS SYSTEMS WITHIN THE BODY
c. MECHANICS AT A CELLULAR AND SUBCELLULAR LEVEL
Biomechanics is studied at all levels:
Subcellular, Physiological and Environmental
TRUE OR FALSE: Biomechanics may be more closely related to bioengineering or biomedical engineering than biophysics.
TRUE
Physical quantities describing motion of living organisms
- Distance (d)
- Displacement (x)
- Speed (v)
- Velocity (v-bold)
- Acceleration (a-bold)
a scalar quantity that describes the total length of the path that the object travels.
DISTANCE
A vector quantity that describes the position of the object measured from a reference point. The quantity has both magnitude and direction.
DISPLACEMENT
A scalar quantity that describes the distance traveled in a given time interval.
SPEED; v = d_t/ t_t
Time rate of change of displacement
VELOCITY; v =∆x/ ∆t
A vector quantity that defines the time rate of change of velocity. It specifies how rapidly the velocity of an object is changing.
ACCELERATION
FORMULA FOR ACCELERATION:
a = (Vf - Vi)/ (tf - ti)
It is the distance covered by the body per unit time
SPEED
TRUE OR FALSE: The average speed of a moving body can be never be zero.
TRUE
TRUE OR FALSE: Speed of a moving body can be positive, negative, or zero (depending on point of reference)
FALSE, CAUSE IT IS VELOCITY
TRUE OR FALSE: Velocity can be used as speed if it is linear direction.
TRUE
Acceleration occurs when the object
SPEEDS UP; SLOWS DOWN; CHANGES DIRECTION
Acceleration is zero if the ______________
Velocity is constant
Changing an object’s state of motion
FORCE
A quantitative description of the interaction between two physical bodies, such as an object and its environment.
FORCE
3 ELEMENTS OF FORCE
Origin
Magnitude
Direction
forces arise because of physical contact between force and object
CONTACT FORCES
forces without physical contact between objects
ACTION-AT-A-DISTANCE FORCES
CONTACT FORCES
FRICTION FORCE
TENSION FORCE
NORMAL FORCE
AIR RESISTANCE FORCE
APPLIED FORCE
SPRING FORCE
ACTION-AT-A-DISTANCE FORCES
GRAVITATIONAL FORCE
ELECTRICAL FORCE
MAGNETIC FORCE
An applied force is a force that is applied to an object by a person or another object (push and pull)
TRUE
The force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself. It is the weight of an object.
GRAVITY FORCE
FORMULA FOR WEIGHT
W = m*g
It is the vector sum of all the forces that act upon an object. It is also called as resultant force (R_F)
NET FORCE
If the net force is 0, the acting forces acting upon an object is ____________________.
BALANCED
If the net force is not equal to zero, the forces acting upon an object is __________________.
UNBALANCED
These forces cause changed in the motion of an object, with different magnitude and direction.
UNBALANCED FORCES
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Newton’s Second Law of Motion: LAW OF ACCELERATION
a = Fnet/ m
Fnet = ma
