Momentum and Impulse Flashcards Preview

IB Physics > Momentum and Impulse > Flashcards

Flashcards in Momentum and Impulse Deck (22)
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1
Q

momentum

A

product of mass and velocity

2
Q

what is momentum measured in?

A

kgm/s

3
Q

is momentum scalar or vector?

A

vector

4
Q

law of conservation of linear momentum

A

in absence of external forces, the total momentum just before a collision/explosion is equal to the total momentum just after the collision/explosion

5
Q

what does the law of conservation of linear momentum apply to?

A

collisions between two objects in straight line

6
Q

What are the two types of collisions?

A

elastic and inelastic

7
Q

What happens in an elastic collisions to the objects?

A

objects bounce apart after collision

8
Q

What happens to the momentum in elastic collisions?

A

conserved

9
Q

What happens to the kinetic energy in elastic collisions?

A

conserved

10
Q

What happens to the objects in inelastic collisions?

A

stick together

11
Q

What happens to momentum in inelastic collisions?

A

conserved

12
Q

What happens to kinetic energy in inelastic collisions?

A

decreases - changed into sound, heat, energy of deformation

13
Q

How many objects are there in explosions?

A

one only

14
Q

What happens to the objects in explosions?

A

split into two parts and travel in opposite directions in straight line

15
Q

What happens to momentum in explosions?

A

conserved

16
Q

What happens to kinetic energy in explosions?

A

increases at start object has no kinetic energy but changed potential energy into kinetic energy

17
Q

impulse

A

what a force gives to an object when it acts on it

18
Q

impulse equation

A

impulse = Ft impulse = change in momentum

19
Q

describe a ball striking a wall.

A

force wall exerts on ball is 0 before impact rises to maximum as ball strikes wall and is deformed decreases to 0 as ball rebounds, regaining shape

20
Q

graph to show ball striking a wall

A
21
Q

what changes if the ball is hard? (time of contact and maximum force)

A

time of contact small maximum force large

22
Q

what changes if the ball is soft? (time of contact and maximum force)

A

time of contact longer maximum force smaller