# Elastic and Inelastic Collisions - Physics 101 / AP Physics 1 Review with Dianna Cowern | Summary and Q&A

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December 16, 2020
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Physics Girl
Elastic and Inelastic Collisions - Physics 101 / AP Physics 1 Review with Dianna Cowern

## TL;DR

Learn about the principles of collisions, including conservation of momentum and energy, and how they apply to different types of collisions.

## Key Insights

• 💥 Collisions involve the transfer of momentum and energy between objects.
• 🥹 Conservation of momentum holds true for all types of collisions.
• 💥 Inelastic collisions result in objects sticking together, while elastic collisions involve bouncing off each other.
• 💥 Kinetic energy may or may not be conserved, depending on the type of collision.
• 💥 Mass and velocity play crucial roles in determining the outcome of a collision.
• 💥 Collisions can be analyzed in one, two, or three dimensions, depending on the situation.
• 🆘 Conservation of momentum is a fundamental concept in particle physics, helping to determine the masses and properties of particles.

## Transcript

This is a toy called a Newton's cradle. Usually you see them about yea big. But it's almost like magic because you lift the ball on the side, and then these three stay still. And this one suddenly flies off. How does this happen? This is so cool. This is also a really big Newton's cradle. No, this is a big Newton's cradle. [EPIC MUSIC PLAYING] Hey,... Read More

### Q: What is conservation of momentum?

Conservation of momentum states that the total momentum of a system before and after a collision remains constant. This means that the sum of the individual momenta of the objects involved in the collision is the same before and after the collision.

### Q: What is the difference between inelastic and elastic collisions?

In inelastic collisions, objects stick together after the collision and move as one. In elastic collisions, objects bounce off each other and retain their individual shapes.

### Q: How is kinetic energy conserved in collisions?

Kinetic energy is conserved in elastic collisions, where the total kinetic energy before and after the collision remains the same. However, in inelastic collisions, some kinetic energy may be lost to heat or deformation, resulting in a decrease in total kinetic energy.

### Q: What is the equation for conservation of momentum?

The equation for conservation of momentum is the sum of the initial momenta equals the sum of the final momenta. Mathematically, it can be written as Σ(m1v1) = Σ(m1v1') + Σ(m2v2') + ... for a system with multiple objects.

## Summary & Key Takeaways

• Collisions between objects involve the transfer of momentum and energy.

• Inelastic collisions occur when objects stick together, while elastic collisions involve objects bouncing off each other.

• Conservation of momentum is a key principle in solving collision problems.

• Mass and velocity determine the outcomes of collisions, and energy may be lost or conserved depending on the type of collision.