linear kinetics Flashcards
what is inertia?
a resistance to change in motion
what is mass?
the quantity of matter of which a body is composed
what is force?
the pushing/pulling effect that one body has on another/the tendency to alter a body’s state of motion
what are the two classifications of forces?
internal and external
what are internal forces?
forces within the body, typically produced by muscles, tendons and ligaments pulling on bones
what are external forces?
any forces from outside the body
what is ground reaction force equal to?
the individual’s weight
in which direction does weight force go on a free body diagram?
down (same as gravity)
why does drag occur?
due to air resistance
what experiences drag?
any object moving horizontally
when is ground reaction force acting?
if there’s contact with the ground
when is reaction force acting?
if there’s contact with any external object
what is newton’s 1st law of motion
every body continues in the same state unless acted upon by an external force
what can newton’s 1st law be related to?
the concept of inertia
what is newton’s 2nd law of motion?
a force actin on. body causes an acceleration which is in the direction of the force and which has a magnitude inversely proportional to the mass of the body
what determines the body’s acceleration?
the net effect of forces acting on a body
in what direction and acceleration will the object move when acted on by an external force?
in the direction of and with the acceleration proportional to the resultant force
what can newton’s 2nd law be related to?
force = mass x acceleration
what is newton’s 3rd law of motion?
for every action that’s exerted by a body on another, there’s an equal and opposite force exerted by the second body on the first
how can newton’s 3rd law be linked to newton’s 2nd law?
the effects that the two bodies produce on each other is different due to differing masses and accelerations
