Chapter 6 Momentum/Impulses Flashcards

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1
Q

momentum can be thought as

A

inertia in motion

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2
Q

if you have mass and velocity you have what?

A

momentum

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3
Q

momentum describes what 2 things?

A
  • motion and how one object can change the motion of another object
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4
Q

Is momentum vector or scalar

A

vector

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5
Q

what is the equation for momentum?

A

p = m X v

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6
Q

unit for momentum

A

kg m/s

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7
Q

unit for impulse

A

N s

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8
Q

equation for impluse

A

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

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9
Q

(delta p) represents what

A

impluse

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10
Q

momentum is defined as

A

mass X velocity

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11
Q

examples of moving objects with large momentums are

A
  • huge ship at low speed

- small bullet at high speed

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12
Q

if an object is not moving it has

A

0 momentum

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13
Q

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

A
  • force

- impulse

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14
Q

impulses are ____ when bouncing takes place

Why?

A

Greater (>)

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

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15
Q

force relates to momentum through

A

time

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16
Q

what are collisions

A

when 2 or more objects hit each other

17
Q

What happens during a collision

A
  • 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
Q

Conservation of momentum equation

A

m1v1 + m2v2 = m1v1’ + m2v2’

19
Q

Law of Conservation of momentum

A

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

20
Q

Conservation of momentum law applies to:

A

all closed isolated systems

21
Q

closed:
isolated:
system:
definitons

A

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

22
Q

Elastic collision

A

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

23
Q

inelastic collision

A

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

24
Q

regarless of the angle what remains unchanged in a collision

A

net momentum