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### Collisions, Part 1

• The linear momentum of an object is a vector equal to the product of its mass and velocity.
• If a force acts on an object for a certain period of time, the average value of the force times the time interval is the impulse provided by the force.
• In a collision, total momentum before collision = total momentum after collision.
• In an inelastic collision, mechanical energy is not conserved; part of the internal energy appears as internal energy of the colliding objects. If two objects stick together when they collide, the collision is said to be completely inelastic.
• In a ballistic pendulum a bullet penetrates a vertically hanging block, which then swings to a certain maximum height whose value depends on the bullet’s velocity.

### Collisions, Part 1

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Linear Momentum 0:10
• Example: Object of Mass m with Velocity v
• Example: Object Bounced on a Wall
• Momentum of Object Hitting a Wall
• Change in Momentum
• Force is the Rate of Change of Momentum 4:30
• Force=Mass*Acceleration (Newton's Second Law)
• Impulse 10:24
• Example: Baseball Hitting a Bat
• Force Applied for a Certain Time
• Magnitude Plot of Force vs Time
• Time of Contact of Baseball = 2 milliseconds (Average Force by Bat)
• Collision Between Two Particles 22:40
• Two Objects Collide at Time T
• Both Object Exerts Force on Each Other (Newton's Third Law)
• Collision Time
• Total Momentum Before Collision = Total momentums After Collision
• Collision 33:58
• Types of Collisions
• Elastic Collision ( Mechanical Energy is Conserved)
• Collision of Particles in Atoms
• Collision Between Billiard Balls
• Inelastic Collision (Rubber Ball)
• Two Objects Collide and Stick (Completely Inelastic)
• Completely Inelastic Collision 41:07
• Example: Two Objects Colliding
• Velocity After Collision
• Heat Produced=Initial K.E-Final K.E
• Ballistic Pendulum 47:37
• Example: Determine the Speed of a Bullet
• Mass Swings with Bulled Embedded
• Kinetic Energy of Block with the Bullet
• Extra Example 1: Ball Strikes a Wall
• Extra Example 2: Clay Hits Block
• Extra Example 3: Bullet Hits Block
• Extra Example 4: Child Runs onto Sled