Topic 8 -Momentum

Question 1

What is momentum ?

Answer 1

A meaure of how difficult it is to stop omething that i moving .

Question 2

What is they key idea behind momentum ?

Answer 2

-All moving object have momentum BUT
-if an obect is not moving , then the momentum is zero .

Question 3

What is the equation for momentum ?

Answer 3

Momentum = mass*velocity
(kgm/s) (kg) (m/s)

TRIANGLE
P+M*V

Question 4

PRACTICE QUESTION
If a car has a mas of 1000 kg and i not moving what is the momentum .

same question with 20m/ speed moving

Answer 4

As the car is not moving at all , the momentum must be zero .
p=mv 100020.

Question 5

What is the conservation of momentum ?

Answer 5

In a closed system , the total momentum before an event is equal to the total momentum after an event .

Question 6

An example with a car and a van .. (1)

Answer 6

-Van is travelling towards a atioanry car .
-Becaue the van is moving , it ha momentum in the forward direction .

Question 7

An example with a car and a van .(3)

Answer 7

-The moemntum of the van is it mass , multiplied by it velocity .
-The stationary car has no momentum asits not moving .
-Now the van collides with the car .

Question 8

An example with a car and a van (4)

Answer 8

Both the van and the car move togetehr ata lwoer velcoity , than the intial velocity of the van .
-The total momentum of the van and car togeher i the Same a the inital momentum of the van itself .

SO , THE TOTAL momentum BEFORE the collision is the ame a the total moemntum , after thre vollion , AKA the mometnum ha been CONSERVED .

Question 9

Cannonball example

Answer 9

Beforre the cannon fires , the cannon and the cannonball are not moving . So the total momentum before firing equals zero .

Question 10

Canonball example (1)

Answer 10

-When the cannon fires , the cannonball i moving at a very large velocity . So the cannonball ha momentum in the forward direction /

Question 11

Cannonball example (2)

Answer 11

At the ame time , the cannon recoils (move backwards) , this means that the cannon ha momentum acting in the backward direction .

Question 12

Cannonbal example (3)

Answer 12

The backwards momntum of the cannon , equals the forward momentum of the cannonball .

-This means that the total momentumafter firing is zero . Showing that momentum has been conserved .

Question 13

CONSERVATTION OF MOMENTUM EXAMPLE
-A van travelleing at 30m/ and ha mass od 2000 kg
it collides with a STATIONARY car that has a mas of 800 kg .
-Both van and car continue moving togetehr ,c alculate hte velcoity of the van and car together .

Answer 13

REMEBER MOMENTUM IS ALWAYS Conserved .
CHECK SHEET .