🏆 Unit: The Truth of Collisions —
Non-contact Energy Transfer
4-PS3-3: Ask questions and predict outcomes about the changes in energy that occur when objects collide.
● PS3.A Definitions of Energy: The energy of a moving object is related to its mass and its speed.
● PS3.B Conservation & Transfer: Energy can be transferred from place to place by moving objects or through collisions, which changes the objects’ motion.
● PS3.C Energy and Forces: When objects collide, force is the medium for energy transfer. In magnetic systems, this is demonstrated through field interactions.
● Asking Questions: Students observe non-contact collisions and ask: "How does energy travel through empty space?"
● Predicting Based on Evidence: Predict displacement outcomes based on changes in input velocity or object mass.
● Cause and Effect: Changes in energy input directly lead to changes in output.
● Energy and Matter: Energy flows and transforms between objects.
After completing observations, students synthesize the data into a logical scientific argument:
Energy travels through magnetic fields without contact. The final motion depends on the input speed (energy) and the target mass.
• Non-contact: Module B moves without being touched.
• Speed: A "Fast Strike" results in larger displacement than a "Slow Drift."
• Mass: Heavier modules travel less distance with the same input.
• Transformation: Attracting modules "click" (sound/heat) instead of sliding.
1. Invisible Bridge: Fields are the "pathway" energy takes to travel across empty space.
2. Potential Energy: Repelling fields act like invisible springs, storing energy and then "kicking" objects into motion (Kinetic Energy).
3. Energy Budget: Energy is a finite resource. A heavier mass "costs" more to move, resulting in less displacement for the same "price" (input).
4. Conservation: Module A stops because it transferred its energy to Module B or transformed it into sound and heat. Energy was traded, not lost.
Downloadable materials to support classroom implementation and student assessment.
The course is divided into three phases, guiding students from observation to quantitative prediction.
Activity 1: The Speed Factor
Setup: Compare a "slow approach" vs. a "fast strike" from Module A toward Module B.
Activity 2: The Invisible Spring (Potential Energy)
Setup: Force Modules A and B together (repelling poles) and then release.
Activity 3: The Mass Factor
Setup: Attach a weight (e.g., penny, dime) to Module B and repeat the collision.
Activity 4: Inelastic Collision
Setup: Flip Module A's polarity to attraction. Observe the "snap" as they jump together.
Activity 5: Magnetic Chain Reaction
Setup: Align Modules A, B, and C. Slide A toward B to trigger a sequential collision.
Activity 6: Vector Thrust Challenge
Setup: Position A and C to approach B simultaneously at a 120-degree angle.
After completing observations, students must connect their findings using the following logical framework:
Energy transfers across space via Non-contact Fields (the "Invisible Bridge"). The resulting motion (displacement) is determined by the Kinetic Energy of the input and the Mass of the object being moved.
● Non-contact Transfer: Module B moves when Module A approaches, even without physical contact.
● Speed Factor: A "Fast Strike" results in significantly larger displacement than a "Slow Drift."
● Mass Variable: Adding weights (coins) to Module B decreases its displacement, even when the energy input from Module A remains constant.
● Transformation: In attracting collisions, the kinetic energy of motion is replaced by a "click" (Sound Energy) and a trace of heat (Thermal Energy) upon impact.
1. The Invisible Bridge (Fields): Energy does not require a solid medium to travel. In this system, the Magnetic Field serves as the pathway, allowing kinetic energy to cross empty space.
2. The Invisible Spring (Potential vs. Kinetic): Energy can be stored or active. When magnets repel, the field acts as an "Invisible Spring" storing Potential Energy. A "Fast Strike" overcomes the field's resistance to compress this spring more intensely, releasing a larger burst of Kinetic Energy.
3. The Energy Budget (Mass & Conservation): Energy is a finite "budget." Moving a larger Mass requires more energy; therefore, with a fixed input, a heavier object will always travel a shorter distance.
4. The Energy Hand-off (Conservation): When Module A slows down or stops, it is not "losing" energy—it is transferring it. The total energy in the system remains constant, whether it is handed off to move Module B or transformed into sound and heat.