The Interactions Idea | A Name Is Not Yet a Cause

Writing “friction” or “gravity” is not enough if the question asks what happens to an object. Likewise, writing “predator” or “food chain” is not enough if the question asks how a population change affects another organism. The useful answer connects the interaction to an observable consequence.

A good interaction explanation contains at least three parts: the actors, the relationship or force, and the resulting change. Where possible, the answer should also point to evidence in the diagram, data or described situation.

Top 100 Interactions Keywords | Forces First, Environment Next

Terms 1–40 build the strongest force-and-effect vocabulary. Terms 41–70 cover environmental relationships. Terms 71–100 preserve the old page’s wider ecology and sustainability vocabulary as enrichment.

1–20 | Magnets and Force Language

1. Interaction — when one part of a situation affects another.
2. Force — a push or pull that can change motion or shape.
3. Push — force acting away from the source of the push.
4. Pull — force acting towards the source of the pull.
5. Contact force — force that acts when objects are in contact.
6. Non-contact force — force that can act without direct physical contact.
7. Magnetic force — attraction or repulsion associated with magnets.
8. Magnet — object that produces magnetic effects.
9. Magnetic material — material attracted by a magnet.
10. Magnetic pole — region near an end of a magnet where magnetic effects are strongest.
11. North pole — one of the two magnetic poles.
12. South pole — the other magnetic pole.
13. Attract — pull towards.
14. Repel — push away.
15. Distance — separation between objects; it can affect observed interaction strength.
16. Strength — magnitude or intensity of an effect.
17. Frictional force — force opposing relative motion between touching surfaces.
18. Friction — interaction between touching surfaces that resists sliding or motion.
19. Surface — outer boundary of an object where contact interactions can occur.
20. Rough — surface quality often associated with greater friction in comparable situations.

21–40 | Motion, Gravity and Springs

21. Smooth — surface quality often associated with less friction in comparable situations.
22. Motion — change in position over time.
23. Speed — how fast something moves.
24. Direction — path or orientation of movement or force.
25. Gravitational force — attractive force between masses; near Earth it pulls objects towards Earth.
26. Gravity — common name for gravitational attraction.
27. Mass — amount of matter in an object.
28. Weight — force due to gravity acting on an object; a bridge to later Science.
29. Earth — body whose gravity dominates familiar falling-object situations.
30. Elastic spring force — force produced when a spring is stretched or compressed.
31. Spring — elastic object that can be stretched or compressed.
32. Stretch — increase length by pulling.
33. Compress — shorten by pushing together.
34. Extension — increase in length from the original state.
35. Deformation — change in shape or size due to force.
36. Balanced forces — forces that produce no net change in motion; enrichment bridge.
37. Unbalanced forces — forces with a non-zero overall effect on motion; enrichment bridge.
38. Effect — observable consequence of an interaction.
39. Cause — factor responsible for producing a change.
40. Change — difference between an initial and later state.

41–70 | Interactions Within the Environment

41. Environment — surrounding living and non-living conditions.
42. Habitat — place where an organism lives and obtains its needs.
43. Ecosystem — organisms and their physical environment considered together.
44. Organism — individual living thing.
45. Population — organisms of one species living in an area.
46. Community — populations of different species living together.
47. Food chain — sequence showing feeding relationships and energy transfer.
48. Food web — network of interconnected food chains.
49. Producer — organism, usually a green plant, that makes its own food.
50. Consumer — organism obtaining energy by feeding on other organisms.
51. Predator — animal that hunts and feeds on another animal.
52. Prey — animal hunted and eaten by a predator.
53. Herbivore — animal that feeds mainly on plants.
54. Carnivore — animal that feeds mainly on other animals.
55. Omnivore — animal that feeds on both plant and animal material.
56. Decomposer — organism that breaks down dead organic matter.
57. Energy transfer — movement of energy from one organism or part of a system to another.
58. Interdependence — condition in which organisms or parts rely on one another.
59. Competition — interaction in which organisms seek the same limited resource.
60. Adaptation — characteristic helping an organism survive or reproduce in its environment.
61. Survival — continued ability of an organism or population to live.
62. Resource — something an organism needs, such as food, water or space.
63. Shelter — protected place used by an organism.
64. Food — source of materials and usable energy for consumers.
65. Water — essential resource for living organisms.
66. Light — environmental factor and energy input important to green plants.
67. Space — area available for organisms to live and obtain resources.
68. Pollution — harmful change or contamination of the environment.
69. Habitat loss — reduction or destruction of habitat.
70. Conservation — protection and careful management of organisms, habitats and resources.

71–100 | Wider Ecology and Sustainability Enrichment

71. Biotic — relating to living components of an environment.
72. Abiotic — relating to non-living components of an environment.
73. Biodiversity — variety of living organisms.
74. Niche — ecological role of an organism.
75. Symbiosis — close relationship between organisms of different species.
76. Mutualism — relationship in which both organisms benefit.
77. Parasitism — relationship in which one organism benefits while another is harmed.
78. Commensalism — relationship in which one benefits and the other is neither significantly helped nor harmed.
79. Trophic level — feeding position in a food chain or web.
80. Primary consumer — consumer feeding directly on producers.
81. Secondary consumer — consumer feeding on primary consumers.
82. Tertiary consumer — consumer at a higher feeding level.
83. Autotroph — organism able to make organic food from inorganic materials using energy.
84. Heterotroph — organism obtaining organic food from other organisms.
85. Scavenger — animal feeding on dead organisms.
86. Keystone species — species with a disproportionately large ecological effect.
87. Invasive species — non-native species capable of spreading and disrupting ecosystems.
88. Endangered species — species facing a high risk of extinction.
89. Ecological succession — gradual change in community composition over time.
90. Greenhouse effect — warming caused by gases absorbing and re-emitting infrared radiation.
91. Climate change — long-term change in climate patterns.
92. Global warming — long-term rise in average surface temperature.
93. Renewable energy — energy from sources replenished naturally on useful timescales.
94. Non-renewable energy — energy from finite sources replenished extremely slowly.
95. Sustainability — meeting present needs while protecting future capacity.
96. Resource depletion — reduction of a resource through use.
97. Habitat fragmentation — breaking a habitat into smaller separated areas.
98. Ecosystem services — benefits people receive from ecosystems.
99. Bioaccumulation — build-up of a substance in an organism over time.
100. Ecological footprint — measure estimating environmental demand from human activity.

Common Interactions Failure Modes

• Force-name dumping: “gravity” or “friction” appears without the effect on motion or shape.
• Direction missing: the answer does not state whether a force helps, opposes, attracts or repels.
• Actor missing: it is unclear which objects or organisms are interacting.
• Food-chain jump: the student skips intermediate population changes and states an unsupported final consequence.
• Ecology overload: advanced terms such as trophic level or keystone species replace the simpler relationship the Primary question actually asks for.

How to Learn Interactions Vocabulary

1. Name the two sides. What is interacting with what?
2. Name the relationship. Attraction, repulsion, friction, gravity, feeding, competition or another relationship?
3. State the direction. Where does the effect act or move?
4. State the consequence. What changes in motion, shape, population or access to resources?
5. Use evidence. Which observation or data supports the claim?
6. Change one condition. Predict how the interaction and result change.

Where the Other Theme Vocabulary Goes

• Diversity — classification and materials.
• Cycles — life cycles, matter and water.
• Systems — plant, human and electrical systems.
• Energy — light, heat, photosynthesis and conversion.

Science Estate Handoff

Stay here for Interactions vocabulary and causal reasoning. Use How Primary Science Changes from P3 to P6 for the developmental learning map, and Science Tuition at eduKatePunggol for service intent.

An interaction is understood when the student can trace who affects whom, how, and with what result.