Chapter 6 Momentum/Impulses Flashcards
momentum can be thought as
inertia in motion
if you have mass and velocity you have what?
momentum
momentum describes what 2 things?
- motion and how one object can change the motion of another object
Is momentum vector or scalar
vector
what is the equation for momentum?
p = m X v
unit for momentum
kg m/s
unit for impulse
N s
equation for impluse
F(delta)t = m (delta)v = (delta) p
(delta p) represents what
impluse
momentum is defined as
mass X velocity
examples of moving objects with large momentums are
- huge ship at low speed
- small bullet at high speed
if an object is not moving it has
0 momentum
when what acts on an object for a period of time we call it ___
- force
- impulse
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)
force relates to momentum through
time
what are collisions
when 2 or more objects hit each other
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)
Conservation of momentum equation
m1v1 + m2v2 = m1v1’ + m2v2’
Law of Conservation of momentum
the total momentum before a collision is the same as the total momentum after the collision
Conservation of momentum law applies to:
all closed isolated systems
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
Elastic collision
a collision in which colliding objects rebound without lasting deformation or the generation of heat
m1v1 + m2v2 = m1v1’ + m2v2’
inelastic collision
a collision in which colliding objects become distorted, generate heat and possibly stick together
m1v1 + m2v2 = (m1 + m2) v’
regarless of the angle what remains unchanged in a collision
net momentum
