Flashcards in Momentum Deck (11)

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1

## what is momentum defined as

### the product of the objects mass and velocity

2

## what is the formula for momentum

###
momentum = mass x velocity

p = m * v

3

## how can the momentum of an object be increased

###
- by increasing the mass of the object

- or by increasing its velocity

4

## what type of quantity is momentum

###
- a vector quantity

- so its a quantity with a size and direction

5

## a 50kg cheetah is running at 60m/s. calculate its momentum

###
p = m * v

momentum = 50kg x 60m/s

= 3000kg m/s

6

## a boy has a mass of 30kg and a momentum of 75kg m/s. calculate his velocity

###
p = m * v

so v = p / m

75 / 30 = 2.5m/s

7

## what is momentum like in a closed system

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- the total momentum before an event is the same as after the event

- no momentum (energy) is lost or gained

8

## what could an 'event' be regarding how momentum might be changed

### a collision, as velocity would be changed

9

## what is the conversation of momentum

### the total momentum before an event is the same as after the event

10

## a red ball is stationary and a white ball is moving with a velocity. explain the changes in momentum in the balls and in general as they collide. the balls are the same size and mass

###
- as the white ball has a velocity ( and a mass) it has momentum

- white ball hits read ball causing it to move

- red ball has a momentum now (velocity and mass)

- white ball keeps moving but at a smaller velocity, so less momentum

- momentum of white and red ball has changed in the collision (event) due to a change in velocities

- but the combined momentum of the red and white ball equals the original momentum of white ball

11