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📘 Form One Physics Notes – Mechanical Properties of Matter: Elasticity, Hooke’s Law, Adhesion & Cohesion, Surface Tension & Capillarity | NECTA-Aligned Study Guide PDF
Master the mechanical properties of matter the simple, exam-ready way — from elasticity and Hooke’s Law to adhesion, cohesion, surface tension, and capillarity.

Written specifically for Tanzanian Form One students, this Physics study guide covers the Mechanical Properties of Matter topic in clear, structured notes. From elastic and plastic deformation to Hooke’s Law, meniscus types, surface tension, and capillary action — every concept is explained with practical examples drawn from Tanzanian daily life, including rubber bands, trampolines, vehicle suspensions, water droplets on taro leaves, kerosene lantern wicks, and water transport in plants.

✨ What’s Inside
✅ Concept of Elasticity:

Clear definition of elasticity and deforming force

Elastic Deformation — temporary change, reversible (rubber bands, metal springs, trampolines, bungee cords, balloons)

Plastic Deformation (Plasticity) — permanent change, irreversible (plasticine, clay, wet sand, soft metals, chewing gum)

Diagram: Deformation Types flow chart

✅ Hooke’s Law:

Definition — “extension is directly proportional to the force applied, provided the elastic limit is not exceeded”

Key Terms — Extension (e = Stretched Length − Original Length), Elastic Limit (maximum force before permanent damage)

Formula: F = k × e

Where F = Force (N), e = Extension (m or cm), k = Spring Constant (N/m or N/cm)

Step-by-Step Worked Example — spring extends 2 cm with 10 N, how much with 25 N?

Real-World Applications:

Vehicle Suspensions and Mattresses

Energy Storage (rubber bands, archery bowstrings)

Engineering and Architecture (bridges, skyscrapers)

✅ Adhesion and Cohesion:

Clear definitions with everyday examples

Cohesion — force of attraction between molecules of the SAME substance (water droplets, mercury spheres, solid strength)

Adhesion — force of attraction between molecules of DIFFERENT substances (water on glass, glue and paper, paint on walls, chalk on blackboard)

Cohesion vs. Adhesion in Liquids — full comparison:

Adhesion > Cohesion — liquid spreads thinly, wets the surface (water on clean glass)

Cohesion > Adhesion — liquid pulls inward into beads, does NOT wet the surface (mercury on glass, water on waxed leaf)

What is a Meniscus? — curved upper surface of a liquid in a narrow container

Types of Meniscus:

Concave Meniscus (U-Shaped) — adhesion > cohesion, water in a glass cylinder

Convex Meniscus (Inverted U-Shaped) — cohesion > adhesion, mercury in a glass cylinder

Important Lab Rule — read bottom of concave meniscus for water, top of convex meniscus for mercury

✅ Surface Tension:

Clear definition — force that makes liquid surface behave like a stretched elastic membrane

Why Surface Tension Occurs — unbalanced cohesive forces at the surface

Diagram: Molecular Force Layout (molecules inside liquid vs. at surface)

Factors Affecting Surface Tension:

Temperature — heating reduces surface tension (hot water cleans better)

Impurities (Soaps and Detergents) — break cohesive bonds, reduce surface tension

✅ Capillarity:

Clear definition — tendency of liquid to rise or fall in a narrow tube (capillary tube)

How Capillarity Works — 4-step process (adhesion, concave meniscus, surface tension, equilibrium)

Factors Affecting Capillarity:

Diameter of the Tube — narrower tube = higher rise

Nature of the Liquid — water shows capillary rise, mercury shows capillary depression

Tube Material — determines adhesive forces

Everyday Examples and Applications:

Plant Nutrition (water transport from roots to leaves)

Lantern Wicks (kerosene lamps)

Towel Absorption (bath towels, paper towels, sponges)

Fountain Pens (ink flow)

Human Blood Vessels (capillaries)

✅ Revision Exercise 6 — full practice set:

Part A: Multiple-Choice Questions (5)

Part B: Short-Answer Questions (5)

Part C: Application & Discussion Questions (3 — Needle Floating Mystery, Water Transport in Plants, Washing Dirty Clothes)

🎯 Perfect For
Form One students studying Physics

NECTA exam preparation and revision

Teachers looking for ready-made teaching material

Parents helping their children study at home

Anyone who wants to understand elasticity, Hooke’s Law, surface tension, and capillarity

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⚠️ Please Note
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🔑 Keywords
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