momentum, energy/work Flashcards
1
Q
units for momentum
A
kg m/s
2
Q
inelastic
elastic
A
1) stick 2gether
2) bounce off
3
Q
magnitude
A
no direction needed
4
Q
impulse
A
change
5
Q
momentum is a ____
what if asking for magnitude
A
vector (negative imp)
if asking for magnitude no negative
6
Q
why is belly-flopping onto the mattress better than the hard floor
why is better to run past a person
why is better to run through a wall
why is better to smack a bottle and let it break
A
longer it takes to stop = less force, less it hurts
less time = more force
7
Q
displacement
A
straight line distance
8
Q
work is a _____
A
scalar
negative sign not imp
9
Q
ke goes up and down w/
ke related to velocity according to
A
mass
square is v2 = 32 ke= 9 x more
10
Q
pe is always
A
respect to the ground
11
Q
K =
UNITS
A
constant
N/M
12
Q
momentum units
A
kg . m/s
