- #1
nysnacc
- 184
- 3
Homework Statement
Homework Equations
mv1 + mv2 = mv1' +mv2'
The Attempt at a Solution
(0.17) (10i - 4j) + (mass of stick) (v j) = (0.17) (sin 20 i + cos 20 j)
what do i need for the mass of stick?
You are told to neglect the change in speed of the stick. I admit it might not be obvious how to deal with that. Here are two ways:nysnacc said:mv1+mv2 =mv1' +mv2'
No, why?nysnacc said:SO for the puck,
mv1 = mv2 ??
There are two different masses. m1v1+m2v2=m1v1'+m2v2'.nysnacc said:mv1 + mv2 = mv1' +mv2'
If you do that straight away (option 2) you cannot use (and will not need) momentum conservation. The change in momentum of the stick becomes indeterminate (0 times infinity).nysnacc said:But setting m2(stick) as infinity?
As I explained, with option 1, setting M to infinity is the final step. You have to get a complete answer as a function of M first.nysnacc said:yes option one then
m1v1 + infinity v2 = m1v1' + infinity v2' ??
Please desist from posting this, it is unhelpful. We will let M go to infinity right at the end, not before.nysnacc said:m1v1 + infinity v2 = m1v1' + infinity v2'
Right, but you need another equation. Use the given coefficient of restitution.nysnacc said:M (v2 - v2') = m1(v1' - v1)
Almost! You have a sign error there. Correct that and solve the pair of equations.nysnacc said:e (v2 - v1) = v2' - v1'
That is the right restitution equation.nysnacc said:e (v2 - v1) = v1' - v2'
As I wrote in post #4, using option 1, we do not set v2' equal to v2 (and certainly not to 0).nysnacc said:(cuz v2' is 0?)
The velocity of a hockey puck after impact is affected by several factors, including the force of impact, the angle of impact, the friction between the puck and the surface, and the elasticity of the puck and the surface it is impacting.
The force of impact has a direct effect on the velocity of a hockey puck after impact. The greater the force, the higher the velocity of the puck will be. This is because the force transfers energy to the puck, causing it to move faster.
Yes, the angle of impact does have an impact on the velocity of a hockey puck. If the puck is struck at a sharper angle, it will have a greater velocity after impact compared to if it is struck at a more shallow angle. This is because the angle affects the direction and amount of force applied to the puck.
The friction between the puck and the surface it is impacting can slow down the puck's velocity after impact. Friction creates resistance against the movement of the puck, causing it to lose some of its energy and therefore decrease in velocity.
Yes, the elasticity of the puck and the surface it is impacting can affect the velocity after impact. A more elastic surface, such as ice, will allow the puck to bounce off with more energy and maintain a higher velocity. Meanwhile, a less elastic surface, such as rubber, will absorb more of the puck's energy, causing it to have a lower velocity after impact.