Question

Quick physics question! Please help!! 3. A 0.200 kg air-track glider moving at 1.20 m/s bumps into a 0.600 kg glider at rest.
a.) Find the total kinetic energy after collision if the collision is elastic.
b.) Find the total kinetic energy after collision if the collision is completely inelastic.

Answer 1

I explained elastic collisions to you before...

Answer 2

sorry I forgot

Answer 3

:(
when you have an elastic collision, there are two conservation laws that you have to adhere to. Conservation of energy and conservation of momentum.

Answer 4

\[\huge p_i=p_f\] where \[\huge p=mv\]
so
\[\huge m_1v_1=m_2v_2\]
1 represents the first glider and 2 represents the second glider which is at rest.
This is the momentum part.

Answer 5

ok..

Answer 6

For an elastic collision, there has to be conservation of kinetic energy. So
\[\huge {1 \over 2}m_1v_1^2={1 \over 2}m_2v_2^2\]
same idea, 1 is the first glider, 2 is the second glider.
there is NO PHYSICS involved.
You said you were good at math. This isn't calculus.
you know how to solve a system of equations right? well the first equation is the momentum, the second is kinetic energy
both equations must be solved simultaneously

Answer 7

have fun

Answer 8

@ybarrap

Answer 9

For a) I got 0.144 J because I used the kinetic energy formula.
For b) well I'm kind of stuck on it

Answer 10

@ybarrap ?

Answer 11

1/2 m v = 1/2 (m + M) v'

pi = pf

Answer 12

that would be for b?

Answer 13

yes

Answer 14

ok so it would be 1/2(0.200)(1.20) = 1/2(0.200+0.600) * 0?

Answer 15

v' is not zero

Answer 16

v is 1.20?

Answer 17

how did you get that?

Answer 18

oh I'm not really sure what v is supposed to be just saw the 1.20 m/s and thought it was that