LECTURE #9 - linear kinetics Flashcards
how many laws of motion are there ?
3
what is the first law of motion ?
law of inertia
what is the second law of motion ?
law of acceleration
what is the third law of motion ?
law of reaction
what is inertia ?
objects resistance to change in state of motion
define law of inertia :
an object at rest or in motion will stay that way, unless acted upon by a net external force or an unbalanced force
what does “uniform motion” mean ?
constant velocity
what does “forced impressed” mean ?
external forces
what is bill nye’s description of law of inertia ?
inertia is a property of matter
TRUE OR FALSE
with inertia you are maintaining a constant velocity unless a force pushes it ?
TRUE
when interpreting law of inertia :
“object at rest and no external forced acting on it” =
remains at rest
when interpreting law of inertia : “object in motion and no external forced acting on it” =
continues moving at constant velocity
when interpreting law of inertia : “object at rest and external forces do act on it” =
object remains at rest only if resultant external forces is zero (net external force = 0)
TRUE OR FALSE
more mass = harder to move (resistance to move)
TRUE
TRUE OR FALSE
mass is dependent on inertia (mass with more mass have more inertia; therefore more difficult to cause a change in the state of motion)
TRUE
what is momentum?
quantity of motion
TRUE OR FALSE
momentum is not important in impact situations
FALSE
momentum is important in impact situations
what are the three points of momentum :
- any object which has both mass & a velocity is said to have momentum
- static objects has zero momentum
- momentum is a vector quantity
TRUE OR FALSE
products of a body’s mass and velocity is momentum
FALSE
what is the formula fr momentum ?
M= (m)(v)
what are the units of measurement for momentum?
(kg)m/s
describe conservation of momentum :
the total momentum of any given system will remain constant unless acted upon by an external force
what is meant by a “system” ?
- object (or group of objects) chosen for analysis
- isolated system : “objects isolated from external forces”
TRUE OR FALSE
momentum before impact = momentum ?
TRUE
talk about the ray lewis vs battering ram video :
- momentum coming from a higher moment
- quantity of motion
what is the formula for force ?
mass x acceleration
