Inertia is the residential property of mass the resists change. Therefore, the is safe tosay that as the fixed of an item increases therefore does its inertia. Weight isthe measure of resting inertia and also momentum is the measure of inertia in ~ acertain velocity. Us all know that at the same forward velocity that wouldbe harder to avoid a rolling car that a rolling bike. Usual sense speak usthat the mass of the auto makes that more complicated to stop. Right here are somesimple rules because that momentum..

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Momentum deserve to be calculated by multiply the mass of an item by its front velocity. (mv = kg*m/s) Mass and also velocity room both directly proportional come the momentum. If you boost either fixed or velocity, the inert of the object increases proportionally. If you dual the fixed or velocity you double the momentum. If you halve the mass or velocity you halve the momentum


At consistent velocity the momentum of an objectremains continuous but if that object comes in call with an additional object thereis a change in momentum (acceleration or deceleration) the is related to thetime of contact. This relationship is dubbed impulse.

advertise = F*Dt F*t = D(m * v )(momentum)

The means that the understanding of advertise becomesuseful is in the application of time. The much longer it bring away to readjust themomentum, the less force is exerted on an object and vice-a-versa.

F = (mv)/t

To recognize this think around stopping acar. If the breaks are applied gently, the momentum of the vehicle is changedgradually over a long duration of time and also the pressure on you the passenger isslight. If friend STOMP on the breaks, the inert of the car changesimmediately and also the pressure on the passenger is great. The advertise is the very same forthe two situations yet the time and also force space different.

Ft =Ft

small force = long time huge force = short time


As you deserve to imagine, the pressure of this crash waslarge due to the fact that the time associated in the momentum readjust was an extremely short.

Look at this example: Bungeejump (

The jumper had the exact same impulse pressure as he wouldhave had if the hit the ground there is no the bungee. The difference is thathe extended the time of his momentum adjust thus diminish the pressure of theimpulse.

Bouncing is a means to increase impulse.Because an item that bounces alters directions the force of impulse have to beabsorbed then produced by the target object. (Impulse is almost doubled.)

Conservation that Momentum:

In the absence of an exterior force, the momentumof a mechanism remains unchanged. What this means is that as objects come incontact v each other, inert is transferred from one item come the nextwithout a net gain or loss in momentum.

momentum before collision= momentum after collision

preservation of momentum follows Newton"s third law of activity / reaction The size and also direction the the impulse on the 2 items will be equal and opposite The net adjust in momentum = 0 presume no frictionCollisions:

Elastic collisions

inert is moved from one object to the next Objects room not deformed in the collision The collision does not generate heat

( pics/break.jpg)

In the over picture. The momentum fromthe cue round is moved to the continuing to be balls in the rack. Over there isno net acquire or loss in the elastic collision.

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Inelastic collisions

Colliding objects come to be entangled or deformed in the collision Collision may generate warm There is no net obtain or ns in momentum, momentum need to be recalculated based upon the brand-new combined masses the the entangled objects


Assuming the the masses that the two cars areequal, the velocity the the linked system should be half.