Newton’s Laws and Linear Momentum: Difference between revisions

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In this code I have simulated what happens when a cart (visualized by the box) is acted upon by the force of a small gust of wind.  
In this code I have simulated what happens when a cart (visualized by the box) is acted upon by the force of a small gust of wind.  
Its initial velocity and momentum is defined and you can clearly see it being affected by the wind.
Its initial velocity and mass is defined and you can clearly see it being affected by the wind.
Due to the wind, its momentum changes because its velocity (both direction and speed) is affected by the wind.
Due to the wind, its momentum changes because its velocity (both direction and speed) is affected by the wind.
https://trinket.io/glowscript/ce43925647
https://trinket.io/glowscript/ce43925647

Revision as of 17:36, 14 April 2016

Claimed by Patrick Todd



The Main Idea

Linear momentum is a vector quantity which is defined by the product of an object's mass, generally denoted as the lowercase "m", and its velocity (a vector), v. Linear momentum is represented by the letter "p" and is generally referred to as momentum for short.

A Mathematical Model

Single Particles

Linear momentum is a vector quantity, like velocity, possessing a direction as well as a magnitude:

[math]\displaystyle{ \mathbf{p} = m \mathbf{v} }[/math]

where p is the vector stating the object's momentum in the three directions of space, and where v is the three-dimensional velocity vector giving the object's movement in each of these directions, and m is the object's mass.

Multiple Particles

The momentum of a system of particles is the sum of both particles' momentum (momenta). If the particles have masses m1 and m2, respectively, and velocities v1 and v2, the total momentum is:

[math]\displaystyle{ \begin{align} p &= p_1 + p_2 \\ &= m_1 v_1 + m_2 v_2\,. \end{align} }[/math]

This model can be used to measure the momentum of a system of any amount of particles.

In Relation to Newton's Second Law

A Computational Model

In this code I have simulated what happens when a cart (visualized by the box) is acted upon by the force of a small gust of wind. Its initial velocity and mass is defined and you can clearly see it being affected by the wind. Due to the wind, its momentum changes because its velocity (both direction and speed) is affected by the wind. https://trinket.io/glowscript/ce43925647

Examples

Simple

Find the momentum of a ball that has a mass of 69kg and is moving at <1,2,3> m/s.

Middling

A car has 20,000 N of momentum. How would the momentum of the car change if: a) the car slowed to half of its speed? b) the car completely stopped? c) the car gained its original weight in luggage?


Difficult

Connectedness

  1. How is this topic connected to something that you are interested in?
  2. How is it connected to your major?
  3. Is there an interesting industrial application?

History

Put this idea in historical context. Give the reader the Who, What, When, Where, and Why.

See also

Further reading

Chabay, Sherwood. (2015). Matter and Interactions (4th ed., Vol. 1). Raleigh, North Carolina: Wiley.

External links

References

This section contains the the references you used while writing this page