# Collisions: Crash Course Physics #10

TLDRThis physics video explores collisions and how momentum and impulse are used to describe them. It covers the concepts of momentum, impulse, elastic and inelastic collisions, perfectly inelastic collisions, and center of mass. Momentum is an object's mass times its velocity. Impulse is the change in an object's momentum. In elastic collisions, kinetic energy is conserved. Inelastic collisions lose some kinetic energy. Perfectly inelastic collisions occur when objects stick together after impact. Center of mass is the average position of an object's mass. Understanding these concepts allows describing collisions mathematically.

###### Takeaways

- 😀 Momentum is an object's mass times its velocity, representing its tendency to keep moving.
- 🤔 Impulse is the integral of force over time, describing the change in an object's momentum during a collision.
- 🌟 In elastic collisions, kinetic energy is conserved. In inelastic collisions, some kinetic energy is lost to other forms.
- 🧐 Momentum is always conserved in collisions, even if kinetic energy isn't.
- 🔍 Newton's third law says that every action has an equal and opposite reaction, applying to collisions too.
- 🤯 Perfectly inelastic collisions involve objects sticking together after the collision.
- 😮 Center of mass is the average position of all the mass in a system.
- 📏 You can calculate center of mass using the masses and positions of individual components.
- ✅ Momentum, impulse and center of mass help describe how objects move and collide.
- 🌟 Understanding concepts like momentum and center of mass unlocks new directions in physics!

###### Q & A

### What is momentum in physics?

-In physics, momentum is an object's mass multiplied by its velocity. It describes the quantity of motion of an object.

### How are momentum and impulse related in physics?

-Impulse is equal to the change in momentum. When two objects collide, the impulse applied leads to a change in momentum.

### What are the differences between elastic and inelastic collisions?

-In an elastic collision, kinetic energy is conserved. In an inelastic collision, some kinetic energy is lost, usually as heat or sound.

### Why is center of mass important in physics?

-Center of mass describes the average position of an object's mass distribution. Understanding center of mass helps analyze motion of irregularly shaped objects.

### How can you calculate the center of mass of a system?

-Calculate each piece of mass multiplied by its distance from a reference point. Sum these, divide by total mass. This gives the center of mass position.

### What is Newton's second law?

-Newton's second law states that the net force on an object equals its mass multiplied by its acceleration.

### What is Newton's third law?

-Newton's third law says that every action has an equal and opposite reaction. If one object exerts a force on another, the second object exerts an equal force back.

### How is momentum conserved in collisions?

-In any collision, momentum is conserved and transferred between objects. The total momentum before and after a collision is always the same.

### What does impulse measure?

-Impulse measures the change in momentum of an object. It is equal to the force applied over time.

### What is a perfectly inelastic collision?

-In a perfectly inelastic collision, objects stick together after impact. Kinetic energy is lost but total momentum is conserved.

###### Outlines

##### 😊 Explaining Momentum and Collisions

This paragraph introduces the concepts of momentum and collisions in physics. It discusses how physics governs moving objects and that collisions involve transfers of momentum and impulse. Key ideas covered include definition of momentum, relation to mass and velocity, concept of impulse, use of Newton's laws.

##### 😯 Mathematical Description of Collisions

This paragraph explains how to mathematically describe different types of collisions using concepts like momentum, impulse, kinetic energy. It covers elastic collisions, inelastic collisions, perfectly inelastic collisions. Also discusses importance of conservation of momentum and use of Newton's third law.

###### Mindmap

###### Keywords

##### 💡Momentum

##### 💡Impulse

##### 💡Elastic Collisions

##### 💡Inelastic Collisions

##### 💡Newton's Second Law

##### 💡Center of Mass

##### 💡Kinetic Energy

##### 💡Perfectly Inelastic Collision

##### 💡Newton's Third Law

###### Highlights

The study found a strong correlation between A and B, suggesting A may influence B.

Researchers developed a new method to measure X, allowing more accurate quantification.

The results showed the treatment group had significantly higher Y than the control group.

Professor Smith proposed a new theory to explain the relationship between X and Z.

The survey revealed interesting insights into how age and gender affect perceptions of A.

The study encontró una fuerte correlación entre A y B, lo que sugiere que A puede influir en B.

Los investigadores desarrollaron un nuevo método para medir X, lo que permite una cuantificación más precisa.

Los resultados mostraron que el grupo de tratamiento tenía un Y significativamente mayor que el grupo de control.

El profesor Smith propuso una nueva teoría para explicar la relación entre X y Z.

La encuesta reveló interesantes informaciones sobre cómo la edad y el sexo afectan las percepciones de A.

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Fourth impactful highlight.

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###### Transcripts

## Browse More Related Video

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