Hockey puck momentum/ collision

  • Thread starter Thread starter miamirulz29
  • Start date Start date
  • Tags Tags
    Collision Momentum
Click For Summary
A 7 kg hockey puck moving at 3 m/s collides with a stationary identical puck on frictionless ice, resulting in two pucks moving at angles of 41.1647 degrees and 48.8353 degrees. The momentum conservation equation is applied, considering both x and y components of the collision. The initial calculations for the speed of the first puck after the collision yielded an incorrect result due to a calculator error. After identifying the mistake, the correct speed was determined to be 1.844 m/s. The discussion emphasizes the importance of accuracy in calculations during physics problems.
miamirulz29
Messages
62
Reaction score
0

Homework Statement


A puck of mass 7 kg moving at 3 m/s strikes an identical puck that is stationery on frictionless ice. After the collision, the first puck leaves with a speed of v1 at an angle of 41.1647 degrees with respect to its original line of motion and the second puck leaves with a speed of v2 at 48.8353 degrees.


Homework Equations


MaVa + MbVb = MaVa' + MbVb'

The Attempt at a Solution


Puck along x-axis:
MVa = MVa' * Cos 41.1647 + MVb' * Cos -48.8353

y-axis:
0 = MVa' * Sin 41.1647 + MVb' * Sin -48.8353


I solved for Va' and got 1.844 (rounded to 3 decimal places), but that answer is wrong. What did I do wrong?
 
Physics news on Phys.org
Figured it out. Calculator error.
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
View full post »

Similar threads

Collision problem: Two hockey pucks collide and stick together....
  • · Replies 4 ·
Replies
4
Views
2K
Conservation of momentum question - elastic collisions
  • · Replies 6 ·
Replies
6
Views
5K
Hockey Puck Collision--momentum problem
  • · Replies 2 ·
Replies
2
Views
4K
How Do You Calculate the Momentum of a Puck After a Collision?
  • · Replies 5 ·
Replies
5
Views
3K
How Do You Prove the Law of Conservation of Momentum in Collisions?
  • · Replies 10 ·
Replies
10
Views
2K
What Are the Final Velocities of Hockey Pucks After a Glancing Collision?
  • · Replies 4 ·
Replies
4
Views
3K
Collision of Hockey Pucks: Solving for Final Speed and Angle
  • · Replies 35 ·
2
Replies
35
Views
5K
Conservation of Angular momentum and linear momentum
  • · Replies 7 ·
Replies
7
Views
5K
What Are the Velocities of Two Blocks After an Elastic Collision?
  • · Replies 3 ·
Replies
3
Views
2K
Solve for 2D Elastic Collision: Find θ & φ Angles
  • · Replies 4 ·
Replies
4
Views
3K