February 2025

Experiment: Generating electricity

By |2025-02-12T09:44:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A dynamo. Image credit wikihow.com A dynamo. Image credit wikihow.com ZIMSEC O Level Combined Science Notes: Experiment: Generating electricity

Aim: To generate electric current

Materials: dynamo, lamp bulb, copper wires, crank or a set of pulleys and weights to turn dynamo, rubber band

Method

  1. Set up the apparatus with the dynamo on a table, the rubber […]
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Testing the strength of various beams

By |2025-02-12T09:09:02+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the strength of beams Testing the strength of beams ZIMSEC O Level Combined Science Notes: Experiment: Testing the strength of various beams

Aim: To make different shaped beams and test their strength

Materials:  thin pieces of poplar wood, sharp knife, weights, 2 clamps, 2 bricks

  1. Cut beams about 20cm long with different cross-sectional […]
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Experiment: Comparing the strength of natural timber and other construction materials

By |2025-02-12T09:25:11+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Comparing the strength of various materials Comparing the strength of various materials ZIMSEC O Level Combined Science Notes: Experiment: Comparing the strength of natural timber and other construction materials

Aim: To compare the strength of some natural timbers and other materials

Materials: Plywood, hard wood cut across the grain, soft wood cut along the grain, […]

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Experiment:Lifting weights using pulleys

By |2025-02-12T09:43:02+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing pulleys using a test meter Testing pulleys using a test meter ZIMSEC O Level Combined Science Notes: Experiment:Lifting weights using pulleys

Aim: To use pulleys to lift loads

Materials:  4 single pulleys, string, 1kg mass/a tin filled with sand, spring balance, clamp stand, meter rule

Method

  1. Set up a fixed pulley as shown above

    2. […]

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People and Energy

By |2025-02-12T09:15:19+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Construction workers require a lot of energy. Image credit nehandaradio.com Construction workers require a lot of energy. Image credit nehandaradio.com ZIMSEC O Level Combined Science Notes: Experiment: People and Energy

  • While it is true that everyone needs energy for metabolism and daily activities
  • Different people have different food needs
  • Food requirements can […]
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Population Dynamics

By |2025-02-12T08:59:06+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit idealscounseling.org

Image credit idealscounseling.orgZIMSEC O Level Combined Science Notes: Population Dynamics

  • Population-all the inhabitants of a particular place/area at one given time
  • The study of changes in population is known as demograph

Factors affecting population change

  • The birth rate-the number of live births per 1000 people per year.
  • Death/Mortality rate-is the number of […]
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