Lesson Notes By Weeks and Term v4 - JHS 2
AGRICULTURAL TOOLS
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AGRICULTURAL TOOLS
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Subject: Science
Class: JHS 2
Term: 3rd Term
Week: 2
Grade code: B8.4.5.1.1
Strand code: 4
Sub-strand code: 5
Content standard code: B8.4.5.1
Indicator code: B8.4.5.1.1
Theme: FORCES AND ENERGY
Subtheme: AGRICULTURAL TOOLS
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Agriculture is a major source of food, jobs and income in Ghana. Whether in the village, peri-urban areas, or school gardens, farmers use agricultural tools to make work easier, faster, safer and more productive. In Science (Forces and Energy), we also learn that many farm tools work because they apply force and often act as simple machines (like levers, wedges and wheel-and-axle) to reduce effort. This lesson focuses on showing and discussing the use of basic and simple agricultural tools used for common on-farm activities (land preparation, planting, weeding, harvesting, transporting, and watering).
2.1 Meaning of Agricultural Tools Agricultural tools are hand tools or simple equipment used on the farm to perform tasks such as clearing, digging, planting, weeding, pruning, harvesting and transporting produce. Basic tools: simple hand tools used by one person (e.g., hoe, cutlass, rake). Simple tools/equipment: still simple but may have moving parts or need more effort/space (e.g., wheelbarrow, watering can, knapsack sprayer). 2.2 Why Farmers Use Tools (Science Link: Forces and Energy) A tool helps a farmer to: apply force more effectively (push, pull, lift, cut), reduce time and energy, improve accuracy (e.g., planting in straight lines), increase safety when used correctly.
Many tools are simple machines: Lever: helps lift or pry using a pivot (e.g., hoe handle acts like a lever when lifting soil). Wedge: splits/cuts materials (e.g., cutlass blade, axe head). Wheel and axle: reduces friction and makes transport easier (e.g., wheelbarrow). Pulley (less common in basic hand tools but used in some farm setups): lifts loads. 2.3 Common On-farm Activities and Tools Used
Below is a clear list of common activities and the tools used in Ghanaian contexts. A. Land Clearing / Bush Clearing Cutlass (machete) Use: cutting weeds, shrubs, small branches; clearing paths and farm plots. How it works: blade acts as a wedge; force is applied by swinging (a push/pull with impact). Axe Use: felling trees, cutting thick branches, splitting wood for stakes. How it works: axe head is a wedge; concentrates force into a small area to split wood. Sickle (where available) Use: cutting grasses and some cereal crops. How it works: curved blade slices; acts like a wedge. B. Land Preparation (Tilling, Digging, Making Beds/Mounds) Hoe Use: digging, loosening soil, making ridges/mounds, weeding. How it works: handle provides leverage; blade cuts soil (wedge action). Spade Use: digging, turning soil, making trenches, moving soil. How it works: flat blade cuts into soil; foot pressure increases force. Shovel Use: scooping and moving loose soil, sand, manure, compost. How it works: broad blade helps lift and transfer materials. Rake Use: gathering leaves/stones, levelling seedbeds, breaking small clods. How it works: teeth pull materials together; uses pulling force. C. Planting / Sowing Dibber (planting stick) Use: making holes for seeds/seedlings (e.g., maize, pepper seedlings). How it works: pointed end concentrates force to pierce soil. Measuring line/rope and pegs Use: planting in straight lines and correct spacing. How it works: improves accuracy and uniformity (not a machine, but a planning tool). D. Weeding and Crop Care Hand fork / hand hoe Use: weeding around small plants, loosening soil near roots. How it works: small lever action; reduces damage to crops. Pruning shears (secateurs) Use: cutting small branches, pruning cocoa, citrus, ornamental plants. How it works: lever system multiplies force at the blades. Knapsack sprayer Use: applying pesticides, herbicides, foliar fertiliser. How it works: pumping creates pressure to spray liquid through a nozzle. E. Harvesting Harvesting knife / cutlass / sickle Use: harvesting cassava, plantain, maize, rice (depending on crop). How it works: wedge action for cutting. Pickaxe (where needed) Use: breaking hard ground, uprooting stumps, digging in rocky soil. How it works: concentrates force at pointed end; uses impact. F. Transporting and Watering Wheelbarrow Use: carrying soil, manure, harvested produce, tools. How it works: wheel and axle reduces friction; also acts like a second-class lever (load between wheel and hands). Head pan / basket (traditional but common) Use: carrying produce, soil, compost. How it works: relies on human force and balance. Watering can Use: watering seedlings and garden crops. How it works: holes spread water gently to avoid washing away soil.
2.4 Worked Examples (Realistic Ghanaian Context) Example 1: Matching tool to activity (School garden) Scenario: Your class is preparing a school garden to plant okro. Question: Which tools are best for (i) clearing weeds, (ii) making beds, (iii) planting seeds, (iv) watering? Answer (with reasons): (i) Cutlass: cuts weeds and small shrubs quickly. (ii) Hoe or spade: loosens soil and shapes beds/ridges. (iii) Dibber (or small stick): makes holes for okro seeds at correct depth. (iv) Watering can: waters gently without destroying the seedbed. Example 2: Simple machine idea (Wheelbarrow) Scenario: A farmer carries 2 bags of manure from the roadside to the farm. Carrying on the head causes fatigue quickly. Using a wheelbarrow makes it easier because the wheel reduces friction and the handles act like a lever, so less force is needed compared to lifting the full load.