- #1
TeaWay
- 9
- 0
So I'm struggling trying to grasp the concept of momentum..due to my physics teacher going WAAAAAAAY too fast && i asked for help he didn't help much at all :\..so i asked my previous physics teacher i had before transferring classes because the school " said so " but it was a bit still confusing ; - ; ...
can someone help me break down the concept a bit and help guide me through this question i am about to provide... before my big exams ): .
A 4kg ball moving at 2 m/s to the right collides head on with a 2kg ball moving at 1 m/s to the left .
a) If the collision is perfectly inelastic, what are the speed and direction of the balls after the collision.
My Work:
p = (m₁ + m₂ ) v₃
v₃= -m₁v₂+pƒ
m₂
p=4kg(2m/s) p=2kg(-1m/s)
p=8kg*m/s p= -2kg*m/s
p initial = 8kg*m/s - 2kg*m/s
p initial = 6kg*m/s
pƒ =(4kg+2kg)v₃
p initial = 6kg*m/s
v₃= 6kg*m/s
6kg
v₃ = 1 m/s
p initial = pƒ (final)
b) if the 4kg ball comes to rest after the collision, what are the speed and direction of the 2kg ball after the collision?
p=4kg(2m/s)
p=8kg*m/s
p initial = p₁ + p₂
p initial = 8kg*m/s - 2kg*m/s
p initial = 6kg*m/s = m₂v₄ = pƒ(final)
c) if the 4kg ball continues to move to the right at 1 m/s after the collision, what are the speed and direction of the 2kg ball after the collision?
d) how much momentum was transferred during this collision?
e) what is the impulse of the collision ?
f) what was the total kinetic energry of the two balls before the collision ?
g) what was the total kinetic energry of the two balls after the collision
h)was the collision elastic or inelastic ? why ?
sorry if i did very little work :\ I am trying to stuff this all in my brain asap because i just finished ch 5&6 a week ago and starting ch 7 and now into 8 soon ... my teacher is going too fast and he tells the class he will not slow down so basically he says " if your behind . we will leave you behind.." I am quite worried :\ i need to pass this class so i can do 4 years of science to set my foundation then when i graduate ..ASTRONOMY HERE I COME O:< ! but i feel discourage :\.
can someone help me break down the concept a bit and help guide me through this question i am about to provide... before my big exams ): .
A 4kg ball moving at 2 m/s to the right collides head on with a 2kg ball moving at 1 m/s to the left .
a) If the collision is perfectly inelastic, what are the speed and direction of the balls after the collision.
My Work:
p = (m₁ + m₂ ) v₃
v₃= -m₁v₂+pƒ
m₂
p=4kg(2m/s) p=2kg(-1m/s)
p=8kg*m/s p= -2kg*m/s
p initial = 8kg*m/s - 2kg*m/s
p initial = 6kg*m/s
pƒ =(4kg+2kg)v₃
p initial = 6kg*m/s
v₃= 6kg*m/s
6kg
v₃ = 1 m/s
p initial = pƒ (final)
b) if the 4kg ball comes to rest after the collision, what are the speed and direction of the 2kg ball after the collision?
p=4kg(2m/s)
p=8kg*m/s
p initial = p₁ + p₂
p initial = 8kg*m/s - 2kg*m/s
p initial = 6kg*m/s = m₂v₄ = pƒ(final)
c) if the 4kg ball continues to move to the right at 1 m/s after the collision, what are the speed and direction of the 2kg ball after the collision?
d) how much momentum was transferred during this collision?
e) what is the impulse of the collision ?
f) what was the total kinetic energry of the two balls before the collision ?
g) what was the total kinetic energry of the two balls after the collision
h)was the collision elastic or inelastic ? why ?
sorry if i did very little work :\ I am trying to stuff this all in my brain asap because i just finished ch 5&6 a week ago and starting ch 7 and now into 8 soon ... my teacher is going too fast and he tells the class he will not slow down so basically he says " if your behind . we will leave you behind.." I am quite worried :\ i need to pass this class so i can do 4 years of science to set my foundation then when i graduate ..ASTRONOMY HERE I COME O:< ! but i feel discourage :\.