# 0.18 Phy1160: force and motion -- momentum, impulse, and conservation  (Page 12/14)

 Page 12 / 14

The comments in Listing 1 explain the steps involved in finding the solution.

The output produced by Listing 1 is shown in Figure 1 with the magnitude and angle of the vector that describes the change of momentum at the end.

Figure 1 . Solution results.
```Start Script The givens.weight = 10000 kg speed1 = 40 m/sangle 1 = 90 degrees speed2 = 20 m/sangle 2 = 0 degrees Computed mass.mass = 1020 kg Components of momentum vectors.P1x = 0 P1y = 40816P2x = 20408 P2y = 0Components of momentum change vectors. deltaPx = 20408deltaPy = -40816 Magnitude and angle of change vector.deltaPm = 45634 m kg/s deltaPa = -63 degreesEnd Script```

I find it interesting that the magnitude of the change in momentum is greater than the magnitude of either the initial or final momentum.

## Change in momentum due to change in speed only

What happens if the car in the previous example changes speed but doesn't change direction.

Solution:

Change the given conditions in the script in Listing 1 to those shown at the beginning of Figure 2 .

Figure 2 . Change in speed only.
```Start Script The givens.weight = 10000 kg speed1 = 40 m/sangle 1 = 90 degrees speed2 = 20 m/sangle 2 = 90 degrees Computed mass.mass = 1020 kg Components of momentum vectors.P1x = 0 P1y = 40816P2x = 0 P2y = 20408Components of momentum change vectors. deltaPx = -0deltaPy = -20408 Magnitude and angle of change vector.deltaPm = 20408 m kg/s deltaPa = 270 degreesEnd Script```

This change causes the car to slow down, but to continue in the same direction. As a result, the angle of the change in momentum is an angle thatis opposite to the direction that the car is moving. The magnitude of the change in momentum depends entirely on the initial and final speeds.

## Change in momentum due to change in direction only

What happens if the car in the previous example changes direction but doesn't change speed?

Solution:

Change the given conditions in the script in Listing 1 to those shown at the beginning of Figure 3 . This scenario simulates the car making a 10-degree turn to the right without changing speed.

Figure 3 . Change in direction only.
```Start Script The givens.weight = 10000 kg speed1 = 40 m/sangle 1 = 90 degrees speed2 = 40 m/sangle 2 = 80 degrees Computed mass.mass = 1020 kg Components of momentum vectors.P1x = 0 P1y = 40816P2x = 7088 P2y = 40196Components of momentum change vectors. deltaPx = 7088deltaPy = -620 Magnitude and angle of change vector.deltaPm = 7115 m kg/s deltaPa = -5 degreesEnd Script```

## Impulse examples

This section contains several examples involving the impulse.

## Pushing a wagon part 1

1. What is the impulse experienced by pushing a 10-kg wagon that was initially at rest, with a constant force of 2 newtons for a period of 3 seconds?

The impulse is given by the product of force and time. The mass of the wagon is superfluous for this question.

impulse = 2 N * 3 s = 6*N*s

## Pushing a wagon part 2

2. What is the acceleration of the wagon in question 1 above?

Now we do need to know the mass.

The most straightforward solution comes from the fact that we know the mass and that the force is uniform. Therefore,

where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
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