Chapter 6 Momentum/Impulses Flashcards Preview

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Flashcards in Chapter 6 Momentum/Impulses Deck (24):
1

momentum can be thought as

inertia in motion

2

if you have mass and velocity you have what?

momentum

3

momentum describes what 2 things?

- motion and how one object can change the motion of another object

4

Is momentum vector or scalar

vector

5

what is the equation for momentum?

p = m X v

6

unit for momentum

kg m/s

7

unit for impulse

N s

8

equation for impluse

F(delta)t = m (delta)v = (delta) p

9

(delta p) represents what

impluse

10

momentum is defined as

mass X velocity

11

examples of moving objects with large momentums are

- huge ship at low speed
- small bullet at high speed

12

if an object is not moving it has

0 momentum

13

when what acts on an object for a period of time we call it ___

- force
-impulse

14

impulses are ____ when bouncing takes place
Why?

Greater (>)
because it requires more impulse to catch something (bring to momentum 0) and then throw it (provide additional impulse)

15

force relates to momentum through

time

16

what are collisions

when 2 or more objects hit each other

17

What happens during a collision

- 2 objects in contact for some amount if time ((delta) t)
- forces have the same magnitude but in the opposite direction (newtons 3rd law)

18

Conservation of momentum equation

m1v1 + m2v2 = m1v1' + m2v2'

19

Law of Conservation of momentum

the total momentum before a collision is the same as the total momentum after the collision

20

Conservation of momentum law applies to:

all closed isolated systems

21

closed:
isolated:
system:
definitons

closed: no momentum comes in our out of the sys.
isolated: no outside forces act on the system
system: all objects being studied

22

Elastic collision

a collision in which colliding objects rebound without lasting deformation or the generation of heat
m1v1 + m2v2 = m1v1' + m2v2'

23

inelastic collision

a collision in which colliding objects become distorted, generate heat and possibly stick together
m1v1 + m2v2 = (m1 + m2) v'

24

regarless of the angle what remains unchanged in a collision

net momentum