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183_notes:momentum_principle [2021/02/04 23:13] – [The Momentum Principle] stumptyl | 183_notes:momentum_principle [2021/09/06 04:25] – pwirving | ||
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==== Lecture Video ===== | ==== Lecture Video ===== | ||
- | {{youtube> | + | {{ youtube> |
==== System and Surroundings ==== | ==== System and Surroundings ==== | ||
- | {{ :183_notes:system_and_surroundings.001.png?250}} | + | {{ 183_notes:week2_sys_sur.png?500}} |
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==== Net Force ==== | ==== Net Force ==== | ||
- | //A force is a vector that quantifies the interactions between two objects.// | + | **A force** is a vector that quantifies the interactions between two objects. |
+ | |||
+ | \\ | ||
There are two types of forces that you will work with in mechanics: [[183_notes: | There are two types of forces that you will work with in mechanics: [[183_notes: | ||
- | The units of force in SI are Newtons (N). 1 Newton is equal to 1 kilogram-meter-per-second squared (1 N = 1 $\dfrac{kg\: | + | |
Systems might interact with several objects in their surroundings, | Systems might interact with several objects in their surroundings, | ||
- | //The Net Force is the vector sum of all forces acting (at an instant) on a system as due to the systems' | + | The **Net Force** is the vector sum of //all forces// acting (at an instant) on a system as due to the systems' |
+ | |||
+ | \\ | ||
Mathematically, | Mathematically, | ||
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where each interaction/ | where each interaction/ | ||
- | == Impulse == | + | \\ |
- | //Impulse is the product of a force and a time interval over which that force acts, which is mathematically equivalent to the change in momentum (Impulse = $\vec{J} \equiv \vec{F} \Delta t$).// | + | === Impulse |
+ | **Impulse** is the product of a force and a time interval over which that force acts, which is mathematically equivalent to the change in momentum (Impulse = $\vec{J} \equiv \vec{F} \Delta t$). | ||
- | Sometimes, you might find it useful to think about the impulse applied to a system as being responsible for the change in momentum of the system. An impulse may be calculated for each force (e.g., //impulse delivered by the gravitational force//) or the total force (i.e., //the " | + | Sometimes, you might find it useful to think about //the impulse applied to a system as being responsible for the change in momentum of the system.// An impulse may be calculated for each force (e.g., //impulse delivered by the gravitational force//) or the total force (i.e., //the " |
===== Examples ===== | ===== Examples ===== | ||
* [[: | * [[: | ||
* [[: | * [[: |