Biomechanical Principles Flashcards
define force
a push or pull that alters or tends to alter the state of motion of a body
what can a force cause a body that is at rest do?
cause it to move
what can a force cause a moving body to do?
- change direction
- accelerate
- decelerate
- change the object’s shape
the equation for force:
force = mass x acceleration
“internal forces are generally produced by _______________ muscle contraction”
concentric
“external forces on an object or structure from the ____________ ; they generally come from the _________________”
outside
environment
list the five external forces
- gravity
- friction
- air resistance
- applied force
- normal contact force
what is gravity?
provide a sporting example wherein gravity is in significant effect
the force pulling objects towards the earth
example
a high jumper falling back to the ground
what is friction?
provide a sporting example wherein friction is in significant effect
the force resisting motion between two surfaces
example
a sprinter pushing off the track
what is air resistance?
provide a sporting example wherein air resistance is in significant effect
the force acting against motion through the air
example
a cyclist experiencing a drag
what is applied force?
provide a sporting example wherein applied force is in significant effect
a force exerted by a person or object
example
a footballer kicking the ball
what is normal-contact force?
provide a sporting example wherein normal contact force is in significant effect
the force exerted by a surface supporting an object
example
the ground pushing back on a gymnast’s hands during a handstand
