Flashcards in Chapter 6 Deck (10)

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1

## Momentum

###
-Mass in motion

-Linear Momentum: The product of mass and velocity (p=mv)

-Vector: Magnitude and direction

-SI: kg * m/s

-Change in momentum requires a net force (F=ma)

2

## Impulse

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-The product of the force and time over which the force acts on an object

-SI: N*s or kg*m/s

-Equal to the change of momentum (P=mv-mv0)

-To have same change:

-Small force over long period of time

-Large force over short time

3

## Collision

### -Any interaction between objects in which there is an exchange of momentum and/or energy

4

## Impulse Momentum Theory

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-Stopping times and distances depend on this

-More mass:

-More time and/or force to stop

-Greater change of momentum must occur for mass to stop

-If the same force is applied, more massive object will travel more distance to come to stop

5

## Relationship between force and time

###
-Inversely proportional

-If one is multiplied by 1/2, other is multiplied by 2

-Ex:

-Airbags: extends time required to stop drivers momentum, large force over short time to hit windshield (time increase--> force decrease)

6

## Law of Conservation of Momentum

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-The moment of all objects interacting with one another remains constant regardless of the nature of the forces between the objects

-If there is no net force, total momentum cannot change

-If internal forces= individual parts of system change, momentum= same

-Momentum= conserved

7

## Inelastic Collision

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-Where there is a collision between two or more objects and the final kinetic energy is different from the initial kinetic energy

-KE is lost in heat or sound (Not conserved)

-Momentum is conserved

8

## Perfectly Inelastic Collision

###
-Two objects stick together after collision

-Max KE has been lost during collision

-Extreme case of Inelastic collision

-Momentum= conserved

9

## Elastic Collision

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-Total KE and momentum= conserved

-Objects collide and return to original shape

-Move separately

-Ex: Football player kicks football

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