Impact Zone Slides Live Feed
Impact
Zone
The Physics of Sports Collisions
Physics 101 // Unit: Momentum & Collisions
Warm-up: The Break vs. The Tackle
Billiards Break
A cue ball strikes a rack of balls at high velocity. What happens to the motion of the cue ball immediately after contact?
Rugby Tackle
Two players collide at full speed. They wrap up and fall together. How does their motion compare to the billiards balls?
How do these interactions differ?
Instructional Segment
Types of Collisions
Watch & Identify
Embedded media
Define Elastic
Define Inelastic
The "Perfect" Myth
Inelastic Collisions
The "Stick" Factor
Objects move together after collision or significantly slow down.
Energy Loss
Kinetic Energy (\(KE\)) is not conserved. It turns into heat, sound, or deformation.
Permanent Change
Objects are often deformed (bent, broken, or crushed).
Pro Example
Car Crash
Total Deformation
Elastic Collisions
The "Bounce" Factor
Objects bounce off each other clearly.
Energy Conserved
Total Kinetic Energy remains constant (ideally).
Elastic Shape
No permanent deformation. Objects return to original shape.
Pro Example
Billiard Balls
Perfectly Bouncy
"Perfectly Elastic" Is Rare
"In the real world, energy is always lost to sound, internal friction, and tiny amounts of heat."
Even a bouncing ball isn't 100% efficient
Sports Analyst Activity
25 Minutes
1. Sort
Review your Moment Cards. Categorize each sport as Elastic or Inelastic.
2. Analyze
Pick ONE moment. Prepare to explain the energy transfer to the class. Where did the \(KE\) go?
3. Report
Briefly present your findings. Use terms like Deformation and Shared Speed.
Play Ball
Scout the Action
Final Discussion
"Is a Home Run in baseball elastic or inelastic? Why is it not 'perfectly' elastic?"
Sound Energy
Internal Friction
Sports Analyst Cards Sports Analyst // Moment Cards
Physics Unit: Collisions & Energy Transfer
Field Report
v1.0
Scout Name:
Date:
Moment #01
The Sweet Spot
A wooden bat strikes a fastball. The ball compresses briefly (deformation) before flying into the outfield at high speed. The bat remains unchanged. There is a loud "CRACK" sound upon contact.
Type:
Key Evidence:
Moment #02
Open Ice Check
A defender collides with a forward at center ice. Both players "stick" together for a moment, sliding as one unit across the ice before falling. Their combined speed is slower than the defender's initial speed.
Type:
Key Evidence:
Moment #03
The Stone Strike
A moving granite curling stone strikes a stationary stone in the "house." The first stone nearly stops, while the second stone glides away. No visible change in shape occurs to the hard granite.
Type:
Key Evidence:
Moment #04
Stuck Landing
A gymnast lands after a vault. The thick foam mat compresses significantly as her feet strike it. She stops moving immediately. The mat stays indented for a second before slowly returning to its shape.
Type:
Key Evidence:
Scout Debrief: The Home Run
"Is a home run elastic or inelastic? Why is it not 'perfectly' elastic?"
Cut cards for sorting activity
Confidential Field Data // Impact Zone
Impact Zone Facilitation Guide Facilitation Guide
Impact Zone: Physics of Collisions
Teacher Resource
Learning Objectives
• Differentiate between elastic and inelastic collisions using visual evidence.
• Explain kinetic energy (\(KE\)) conservation and loss in real-world scenarios.
• Critique the concept of "perfectly elastic" collisions in biological and mechanical systems.
Video Guide: "Pause & Predict"
Timestamp guide for the embedded YouTube video:
2:26
Pause Prompt: "If two objects stick together, what happens to their individual speeds?" (Target: They must share a final velocity, often slower than the original).
4:15
Pause Prompt: "What is the key question we ask to identify elastic collisions?" (Target: Did the objects bounce?)
6:52
Vote: Car vs Pole. Ask for a show of hands (Elastic vs Inelastic). Reason: Permanent deformation + sticking = Inelastic.
Pacing
Warm-up5m
Video & Discussion10m
Analyst Activity25m
Closure5m
Pro Tip
When students ask about the baseball hit, remind them of the "Crack" sound. Sound is energy leaving the system! This is why it's not "perfectly" elastic.
Analyst Card Key
#01 Baseball Hit
Classification: Mostly Elastic (Approx.)
Reasoning: High bouncing speed, temporary deformation. Kinetic energy is lost to Sound and Internal Friction (heat).
#02 Hockey Check
Classification: Inelastic
Reasoning: Players "stick" together. Shared final velocity. Kinetic energy is lost to body deformation/friction with ice.
#03 Curling Stone Strike
Classification: Elastic (Near-Perfect)
Reasoning: Clear bounce. Minimal deformation (granite). Sound is minimal. Velocity transfer is highly efficient.
#04 Gymnastics Landing
Classification: Inelastic
Reasoning: Gymnast stops instantly. Mat absorbs nearly all \(KE\) through major deformation (crushing foam cells).