http://acept.la.asu.edu/courses/phys110/course_info/class_notes/momentum/momentum.html

Notes:

Momentum

Inertia is the building of mass that resists change. Therefore, it is safe tosay that together the mass of an object increases therefore does that inertia. Weight isthe measurement of resting inertia and also momentum is the measure of inertia at acertain velocity. We all recognize that in ~ the exact same forward velocity the wouldbe more tough to stop a rolling automobile that a rojo bike. Usual sense tells usthat the massive of the car makes that more complicated to stop. Below are somesimple rules for momentum..

You are watching: A measure of how hard it is to stop an object

Momentum have the right to be calculation by multiplying the fixed of an object by its forward velocity. (mv = kg*m/s) Mass and also velocity are both directly proportional come the momentum. If you boost either fixed or velocity, the inert of the object boosts proportionally. If you dual the massive or velocity you dual the momentum. If friend halve the fixed or velocity you halve the momentum

Impulse:

At continuous velocity the inert of an objectremains consistent but if the object come in call with an additional object thereis a adjust in inert (acceleration or deceleration) the is regarded thetime that contact. This relationship is dubbed impulse.

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

The means that the understanding of impulse becomesuseful is in the application of time. The much longer it take away to adjust themomentum, the less pressure is exerted on an item and vice-a-versa.

F = (mv)/t

To recognize this think around stopping acar. If the breaks are used gently, the inert of the car is changedgradually over a long period of time and also the force on you the passenger isslight. If you STOMP top top the breaks, the inert of the vehicle changesimmediately and also the force on the passenger is great. The impulse is the exact same forthe 2 situations however the time and also force space different.

Ft =Ft

little force = lengthy time huge force = short time

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(www.netcar.co.il/img2/milon/50%20Crash%20test%20s.jpg)

As you deserve to imagine, the force of this crash waslarge since the time involved in the momentum readjust was very short.

Look in ~ this example: Bungeejump (www.romansempire.com/jump.jpg)

The jumper had the very same impulse pressure as that wouldhave had actually if he hit the ground without the bungee. The difference is thathe expanded the time the his momentum change thus decreasing the pressure of theimpulse.

Bouncing is a way to boost impulse.Because an item that bounces transforms directions the force of impulse should beabsorbed then generated by the target object. (Impulse is nearly doubled.)

Conservation the Momentum:

In the lack of an exterior force, the momentumof a system remains unchanged. What this method is that as objects come incontact through each other, inert is transferred from one item to the nextwithout a net obtain or loss in momentum.

momentum before collision= inert after collision

preservation of momentum follows Newton"s 3rd law of action / reaction The size and also direction of the advertise on the two items will be equal and opposite The net change in inert = 0 suspect no frictionCollisions:

Elastic collisions

inert is moved from one object to the following Objects room not deformed in the collision The collision does no generate heat

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(www.petersbilliards.com/ pics/break.jpg)

In the over picture. The inert fromthe cue round is transferred to the remaining balls in the rack. Over there isno net get or loss in the elastic collision.

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Inelastic collisions

Colliding objects come to be entangled or deformed in the collision Collision might generate heat There is no net obtain or loss in momentum, momentum should be recalculated based upon the new combined masses the the entangled objects

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(solomon.physics.sc.edu/.../explain/images/inelastic7.jpg)

Assuming that the masses that the 2 cars areequal, the velocity the the combined system should be half.