LECTURE #17 - angular kinematics (2) Flashcards
acceleration of a body in angular motion may be resolved into what two components ?
tangential and radia (a.k.a centripetal)
what is tangential acceleration ?
- represents the change in linear velocity for a body traveling on a curved path
- directed tangential to curved pathway
what is tangential acceleration tangential to ?
to path of motion
what must alpha be expressed in ?
rad/s/s
what did newton state in “principia” (the book where he first published his laws) ?
a centripetal force is that by which bodies are drawn or impelled, or any way tend, towards point as to a centre
“a centripetal force is that by which bodies are drawn or impelled, or any way tend, towards point as to a centre” is essentially saying that …..
an object must be forced to follow a curved path
what does a change in direction = ?
a change in velocity
what does a change in velocity = ?
acceleration
what is required to change direction and keep an object travelling along a curved path ?
acceleration
acceleration is required to change direction and keep an object travelling along a curved path, but where does it come from ?
radial centripetal acceleration
what does the radial / centripetal acceleration direct toward ?
the centre, along the curved path
what does the radial /centripetal acceleration represent ?
change in direction
FILL IN THE BLANK
in regards to radial / centripetal acceleration, linear speed of an object traveling a curved path remains ___________
constant
TRUE OR FALSE
with radial / centripetal acceleration, direction of object travelling a curved path is never changing
FALSE
with radial / centripetal acceleration, direction of object travelling a curved path is CONSTANTLY CHANGING
TRUE OR FALSE
radial acceleration is also perpendicular to path of motion (centre seeking)
TRUE
what do changes in direction result in ?
changes in velocity (even if velocity magnitude is constant)
TRUE OR FALSE
changes in velocity result in radial acceleration
TRUE
TRUE OR FALSE
radial acceleration is caused by ground reaction forces directed toward the centre of the turn
TRUE
what is the purpose of a banked turn ?
trying to produce force in order to make a turn
Describe how a taller individual with longer limbs may have a biomechanical advantage in kicking a ball for maximal horizontal displacement over a shorter individual :
these biomechanical advantages contribute to the taller individual being able to generate greater force, speed, and momentum, resulting in a more powerful and potentially longer kick of the ball for maximal horizontal displacement.
