Hockey puck momentum, conservation of linear momentum

In summary, the drawing shows a collision between two pucks on an air-hockey table, with puck A having a mass of 0.0480 kg and a velocity of +7.76 m/s along the x-axis and colliding with puck B, which has a mass of 0.0960 kg and is initially at rest. The collision is not head-on and after the collision, the two pucks fly apart with the angles shown in the drawing. The speed of puck A is 4.77 m/s and the speed of puck B is 3.595 m/s.
  • #1
jehan4141
91
0
ch07p_30.gif


The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.0480 kg and is moving along the x-axis with a velocity of +7.76 m/s. It makes a collision with puck B, which has a mass of 0.0960 kg and is initially at rest. The collision is not head-on. After the collision, the two pucks fly apart with the angles shown in the drawing. Find the speed of (a) puck A and (b) puck B.

There are no answers provided. Could someone please tell me if my answers are correct?

Momentum in the y direction
Piy = Pfy
0 = MaVasin65 + -MbVbsin37
MaVasin65 = MbVbsin37
Va = MbVbsin37 / Ma*sin65
Va = (0.096sin37Vb) / (0.048sin65)

Pix = Pfx
0.048(7.76) = 0.048cos65Va + 0.096cos37Vb

Plug Va in and you get Vb = 3.595 m/s and thus Va = 4.77 m/s ?
 
Last edited:
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  • #2
Yes.
 

1. What is momentum?

Momentum is a property of an object that describes its motion. It is calculated by multiplying an object's mass by its velocity. In other words, momentum = mass x velocity.

2. How is momentum conserved in hockey?

In hockey, momentum is conserved through collisions between players or the puck. This means that the total momentum of the system (players and puck) before a collision is equal to the total momentum after the collision. This is known as the conservation of linear momentum.

3. What is the importance of momentum in hockey?

Momentum is important in hockey because it affects the speed and direction of the puck. The more momentum the puck has, the harder it is to stop or change its direction. This is why players use their bodies to block or redirect the puck, as it is easier to use their own momentum than to try and stop the puck's momentum.

4. How does the mass of a hockey puck affect its momentum?

The mass of a hockey puck directly affects its momentum. The more massive the puck is, the more momentum it will have at a given velocity. This is why a heavier puck can be more difficult to control and can cause more damage if it hits a player or object with a lot of force.

5. Can momentum be transferred between players and the puck?

Yes, momentum can be transferred between players and the puck. When a player hits the puck with their stick, they are transferring their momentum to the puck, causing it to move in the direction they hit it. Similarly, when a player receives a pass from a teammate, they are also transferring momentum from the puck to themselves.

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