# Collision problem: Two hockey pucks collide and stick together....

• Jeemeli
The final speed of the two pucks stuck together after the collision is 2.52 m/s, and the angle of their motion is 47.6 degrees from the original direction of the first puck's motion.
Jeemeli

## Homework Statement

Two hockey pucks collide in a 90 degree angle and stick to each other. What's the speed of the hockey pucks after the collision and in what angle are the pucks moving in.

m1=0.71kg
m2=0.52kg
v1=1.6m/s
v2=3.8m/s

## The Attempt at a Solution

m1v1+m2v2=v(m1+m2)
=0.71kg*1.6m/s+0.52kg*3.8m/s=(0.71kg+0.52kg)*v
=v=(3.1kgm/s)/1.23kg=2.52m/s

Hi Jeemeli and welcome to PF.

kuruman said:
Hi Jeemeli and welcome to PF.

My solution was wrong, Id like to know how to get the right answer

Jeemeli said:
m1v1+m2v2=v(m1+m2)
=0.71kg*1.6m/s+0.52kg*3.8m/s=(0.71kg+0.52kg)*v
You've gone from a correct formula involving vector velocities and applied it to scalar speeds.

If you walk 1.136 meters north and 1.976 meters east, how far from your starting position will you be as the crow flies?

Jeemeli said:
My solution was wrong, Id like to know how to get the right answer
In short, this is a two-dimensional collision.

## 1. What is a collision problem in physics?

In physics, a collision problem refers to the study of the interaction between two or more objects that come into contact with each other and exchange energy or momentum.

## 2. How does the collision of two hockey pucks affect their motion?

When two hockey pucks collide and stick together, their combined mass and momentum will determine their new velocity and direction of motion. This is known as the conservation of momentum.

## 3. What factors can affect the outcome of a collision between two hockey pucks?

The outcome of a collision between two hockey pucks can be affected by factors such as the mass, velocity, and angle of collision of the pucks, as well as any external forces acting on them.

## 4. Is the collision between two hockey pucks an elastic or inelastic collision?

The collision between two hockey pucks is typically considered to be an inelastic collision, as the pucks stick together and some of the kinetic energy is lost in the form of heat and sound.

## 5. How can the conservation of momentum be applied to solve a collision problem?

The conservation of momentum can be applied to solve a collision problem by setting the initial and final momenta of the objects equal to each other, and solving for the unknown variables using the principle of conservation of momentum.

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