1.Only thermal energy transfers; 'cold' is absence of thermal
energy
2.Temperature measures average kinetic energy; heat is energy
transfer
3.Metals conduct heat faster, so they feel cold by drawing heat from
your hand
4.Energy is conserved; it transforms between forms but total amount
stays constant
[!] STUDY GUIDE: Big Ideas
Use to answer form questions!
1.Energy transfers between objects during collisions.
When objects collide, kinetic energy moves from one object to
another.
2.Elastic collisions conserve kinetic energy.
Objects bounce apart with the same total KE. Inelastic collisions
convert some KE to other forms (sound, heat, deformation).
3.Total energy is ALWAYS conserved. Even when KE
decreases, the energy goes somewhere (thermal, sound, etc.) - it
doesn't disappear!
Ball A Moving->COLLISION->Energy Transfer->Ball B Moving
ELASTIC: KE conserved | INELASTIC: Some KE -> thermal/sound
[#] KEY TERMS
Define in YOUR words
Collision
Objects hitting each other
Elastic
Bouncy - KE conserved
Inelastic
Not bouncy - some KE lost
Energy Transfer
Energy moving between objects
[?] THE PHENOMENON
Write BEFORE Hook form
Why do billiard balls sometimes stop completely after collision?
When a cue ball hits another ball head-on, it often stops dead while
the other ball rolls away. Where did the cue ball's energy go?
Your initial thinking:
[>] AFTER HOOK FORM
Reflect, then continue+2 pts
I learned that...
Station 1 — Collision Investigation
In an elastic collision...
In an inelastic collision...
Key insight:
Station 2 — Momentum & Energy Analysis
Total momentum before =
Total momentum after =
Key insight:
[/] DAY 1 EXIT TICKET
Complete before leaving+5 pts
Q1:
A moving car rear-ends a parked car. Where does the moving car's
kinetic energy go?
Q2:
Why is a bouncy ball collision called "elastic" while a car crash is
"inelastic"?
Confidence:
Energy Transfer in Collisions (continued)
Name:
[=]Day 2 start
Station 3 — Design a Safety Device
My device will protect by...
It works because energy is...
Trade-offs in my design:
Key insight:
[+] MAKING CONNECTIONS
Use for Exit Ticket!
How does energy transformation in collisions (W6) connect to PE/KE
transformations (W5)?
Why do safety engineers design crumple zones to be inelastic rather
than elastic?
[/] DAY 2 EXIT TICKET
Final check before Science Circle+5 pts
Q1 (NEW):
Why doesn't energy disappear in a collision? Where does it go if
objects slow down?
Q2 (SPIRAL-W5):
A skateboarder rolls down a ramp and collides with a wall. Trace the
energy from top of ramp to after the collision.
Q3 (INTEGRATION):
Explain why airbags save lives using energy transfer concepts. What
type of collision do they create?
CHECKTEST YOUR THINKINGRate each: FALSE ← 1–2–3–4–5 → TRUE
1. Cold can transfer from one object to another
F12345T
2. Temperature and heat are the same thing
F12345T
3. Metals are naturally colder than other materials
F12345T
4. Energy can disappear or be used up
F12345T
5. Only thermal energy transfers; 'cold' is absence of thermal energy
F12345T
Pick any TWO statements — especially any you rated 2, 3, or 4. Justify your rating with evidence:
Statement #___ — I rated it ___ because:
Statement #___ — I rated it ___ because:
[O] SCIENCE CIRCLE
~15 min | End of week+3 pts
[!] My "Aha!" Moment
[?] My Remaining Question
Discussion Protocol: Share ahas, listen actively,
record class discoveries.