Impact: Coefficient of Restitution (learn to solve any problem)

Learn about the coefficient of restitution with animated examples step by step.

Intro (00:00)
Ball A has a mass of 3 kg and is moving with a velocity of 8 m/s (01:27)
The 0.5-kg ball is fired from the tube at A with a velocity of (02:36)
The 200-g billiard ball is moving with a speed of 2.5 m/s when it strikes the side of the pool table at A. (04:51)

Book used: R. C. Hibbeler and K. B. Yap, Mechanics for engineers - dynamics. Singapore: Pearson Education, 2014.

[caylinnimmo]

This is only channel that I don't watch at 2X speed

[easymoney]

Thanks bro I've been learning a lot with you

[juancantera]

5:23 why are the x-components of velocity equal for both before and after it hits the side of the table? You also mention that the x-component of velocity is parallel to the x-axis, but is the y-component also not parallel to the y-axis? So why do we ignore the x-component of velocity?

[nivlem]

Hello can I ask how did you get the VA= -0.16 and Vb= 8.24??

[ryanbragg]

When using the coefficient of restitution at 3:43, does anyone know if the velocities are interchangeable? I'm confused how he knows which velocity is the ground and which is the ball.

[dikendrabaduwal]

i have one doubt in 2nd question, when ball is strike in ground and make another velocity, at that time why we didn't take component, i mean why not only take the vertical velocity of object to calculate maximum height..?

[baconpancakes]

At 6:28 why is your VBX2 and VBX1 on different axis? Like your VBX1 isn't parallel to your newly drawn x-axis

[chadbullard]

The magnitude of Va is 2.6 m/s in last example? You got Vb as 1.499 m/s, but I did not see Va?

[qj]

In the first example, why do you take B to have a negative velocity when in the question it says the velocity is +4ms-¹

[MUSICXOFFICIAL]

hi I have a question, @2:00 why isn't 3VA be negative?

[emswoooo]

um hello I got kinda lost. How did you get the 8.4 = (Vb)-(Va) in 2:24

[AntwonDacosta]

have u done vid on solving the two equations with 2 unknowns im kinda lost at that point

[joaobrites]

hello. great video as always. i have a question, could we use the conservation of energy in the question of the ball and the cannon? because i did it, since we have values for the velocity and height to discover the value of the velocity in B (where height=0). but the thing is, if you plug in the values, you get a different answer for velocity in B and therefore a different answer for the final height.. what did i do wrong? thank you.

[mebawubeshet]

why do not we just apply the e formula for both x and y i do not get it why the x component does not change. please give me explanation and do not simply said it is parllel to x axis

[patrickalanpangilinan]

is momentum conserved on both line of impact and plane of impact?

[ibrahimhashmi]

Hello. I dont understand why the velocities are the same after hitting the table in q3. What does the velocity being parallel to the axis have to do with their values. Thank you

[e-nes]

teacher, we should get Vax2 because it impacts x component but you got Vay2 why? at 5.30

[paulnicholas]

you made a small mistake by switching the components of v in the last problem and the second collision, but greater teacher I always understand everything so not complaining about it just so other people don't get confused.

[saiprasadsatya]

Is it mandatory to take positive and negative values for different directions

[willgggg]

at 5:56 why is the initial velocity on the x axis(vax) the same as the after collison velocity on the x axis