# Hockey puck momentum/ collision

• miamirulz29
In summary, a puck of mass 7 kg moving at 3 m/s collides with a stationary identical puck on frictionless ice. After the collision, the first puck leaves with a speed of v1 at an angle of 41.1647 degrees and the second puck leaves with a speed of v2 at 48.8353 degrees. Using the equations for momentum conservation, the final velocities for each puck can be calculated. However, when finding the final velocity for the first puck, there was a calculation error due to a miscalculation on the calculator.
miamirulz29

## 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?

Figured it out. Calculator error.

Your approach to solving the problem using the conservation of momentum equation is correct. However, it seems that you have made a small error in your calculation. When solving for Va', you should use the value of Mb (mass of the second puck) instead of Ma. This is because the second puck is initially at rest and therefore has no initial momentum. So the correct equation would be:
MVa = MVa' * cos 41.1647 + 0 * cos -48.8353
Solving for Va', we get a value of 3.427 m/s, which is the correct answer. Keep in mind that when using conservation of momentum, it is important to use the correct masses and velocities for each object in the equation.

## 1. What is momentum in hockey?

In hockey, momentum refers to the amount of force or energy that a hockey puck has while it is moving. It is determined by the mass and velocity of the puck.

## 2. How is momentum calculated in hockey?

Momentum in hockey is calculated by multiplying the mass of the puck by its velocity. The formula for momentum is: momentum = mass x velocity.

## 3. How does the momentum of a hockey puck affect collisions?

The momentum of a hockey puck directly affects collisions. When two pucks collide, the total momentum of the system remains constant. This means that the momentum of the first puck before the collision is equal to the momentum of both pucks after the collision.

## 4. Can the momentum of a hockey puck be changed?

Yes, the momentum of a hockey puck can be changed. It can be increased or decreased by changing the mass or velocity of the puck. For example, if a player increases their speed while skating, the momentum of the puck they are carrying will also increase.

## 5. How does momentum conservation apply to hockey?

Momentum conservation is a fundamental principle in physics that states that the total momentum of a system remains constant during a collision or interaction. In hockey, this means that the total momentum of the puck and players before a collision will be equal to the total momentum after the collision.

Replies
4
Views
2K
Replies
6
Views
5K
Replies
2
Views
4K
Replies
5
Views
3K
Replies
10
Views
2K
Replies
4
Views
3K
Replies
35
Views
4K
Replies
7
Views
4K
Replies
3
Views
2K
Replies
4
Views
2K