# Shared Flashcard Set

## Details

Biomechanics
Lesson Two
45
Fitness
Not Applicable
05/29/2011

Term
 Speed
Definition
 How quickly a position changes.
Term
 Velocity
Definition
 The rate, or a measure of the rate, of motion.
Term
 Acceleration
Definition
 A change in the velocity of an object.
Term
 Energy
Definition
 The capacity to do work.
Term
 Work
Definition
 Transfer of energy by a force acting to displace a body.
Term
 Power
Definition
 Time rate of doing work or (Force x Distance) / Time.
Term
 Watt
Definition
 A unit of power in the International System of Units equal to one joule per second.
Term
 Torque
Definition
 The truning effect created by a force about an axis.
Term
 Linear Motion
Definition
 Change in position that occurs when all points on an object move the same distance, in the same direction, and at the same time.
Term
 Linear Momemtum
Definition
 Mass of an object times the linear velocity of the object.
Term
 Kinectic energy
Definition
 The energy possessed by a body because of its motion.
Term
 Potential energy
Definition
 Energy stored by an object by virtue of its postion.
Term
 Asymmetrical
Definition
Term
 Balance
Definition
 is a stable state characterized by the concellation of all forces by equal, opposing forces.
Term
 Resistance arm
Definition
 The distance between the fulcrum and the point of resistance is known as the
Term
 Force couples
Definition
 Torque created about an axis by a pair of oppositely directed forces is referred to as:
Term
 Center of gravity
Definition
 The point where the mass of the object is equally balanced is known as the:
Term
 Kinetic chain
Definition
 A group of body segments, known as a ______, are connected by joints so that the segments operate together to provide a wide range of motion for the limb.
Term
 Rotational inertia
Definition
 As a rotating body spins about an external or internal axis, ________opposes any change in the body's speed of rotation that may be caused by a torque.
Term
 Angular momentum
Definition
 Also thought of as "amount of rotation" of the body, _______ is the product of the momentum of a rotating body and its distance from the axis of rotation.
Term
 Antagonist
Definition
 refers to the role of a muscle whose torque opposes the action.
Term
 Agonist
Definition
 refers to the role of a muscle whose torque aids the action, often referred to as the prime mover.
Term
 Strength balance
Definition
 The force production relationship between opposing muscles or muscle groups is known as:
Term
 Newton's first law of motion
Definition
 Law of Inertia:  An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force.
Term
 Newton's second Law of motion
Definition
 The force exerted on a body equals the resulting change in the body's momentum divided by the time elapsed in the process.
Term
 Newton's Third Law of Motion
Definition
 To every action there is always an equal and opposite reaction.
Term
 tensile forces
Definition
 those in which tension results in a pulling force.
Term
 Compressive forces
Definition
 those that exert a pushing force.
Term
 contact forces
Definition
 occur when two objects contact one another.
Term
 Frictional force
Definition
 the force acting on the body when the body is not in motion,  but when a force is acting on it.
Term
 Linear motion
Definition
 move same distance, in the same direction, at the same time.
Term
 Angular motion
Definition
 all points on a body move in circles around a fixed axis.
Term
 Speed Velocity
Definition
 If the starting position is known, a particular motion can be quantified by:
Term
 Work (w)/ time taken to do the work (T)
Definition
 Power =
Term
 True
Definition
 T/F? As a muscle's contraction velocity increases, its maximal force output decreases.
Term
 quanity of power the time it is sustained
Definition
 Power out put is dependent upon which two factors?
Term
 force attachment location
Definition
 The torques created by the muscles of the body are dependent upon which two components?
Term
 9.81 m/sec2
Definition
 Gravity pulls on the center of mass of an object at the rate of:
Term
 transverse abdominis and multifidus muscles
Definition
 What two muscles represents the primary stabilizer for the lumbopelvic region?
Term
 D. Contact force
Definition
 When swimming, water is an example of what type of resistive force?   A. Tensile force B. Compressive force C. Non-Contact force D. Contact force
Term
 B. Positive work
Definition
 The concentric phase of a military press is an example of which of the following?   A. negative work B. Positive work C. potential energy D. frictional force
Term
 C. contractile velocity
Definition
 Which of the following has the greatest effect on a measured power output?   A. muscle initial length B.  Neutralizing properties C. contractile velocity D. location of the center of gravity
Term
 C. the hip flexors cause anterior pull on the spine leading to disc comression
Definition
 Leg lifts are contraindicated due to :   A. The resistive torques place excessive stress on the rectus abdominis B. The cervical spine may vecome stained C. the hip flexors cause anterior pull on the spine leading to disc compression D. The pelvis is pulled into a posterior tilt
Term
 A. pelvis migrates into a posterior pelvic tilt
Definition
 What is a common biomechanical problem caused by performing the leg press exercise with tight hip extensors?   A. pelvis migrates into a posterior pelvic tilt B. The knees are forced past the toes C. Cervical spine stress occurs due to neck flexion D. All of the above
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