June 2016

To investigate whether the length of a beam affects its strength

By |2022-09-15T12:38:26+02:00June 9th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the length and strength of beams

Testing the length and strength of beams ZIMSEC O Level Combined Science Notes: Experiment:To investigate whether the depth of a beam affects its strength

Aim: To show how the length of a beam affects its strength

Materials: drinking straws, clamps, weights

Method

  1. Clamp the ends of a straw […]

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Investigating whether thick beams support more weight

By |2022-09-15T12:38:27+02:00June 9th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Plasticine can be used to model cylinder beams. Image credit wordpress.com

Plasticine can be used to model cylinder beams. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Investigating whether thick beams support more weight

Aim: To show that thicker beams can support more weight

Materials: Plasticine/Stikistuff, wooden board, small cardboard cylinders 2cm in […]


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Testing the strength of various beams

By |2022-09-15T12:38:28+02:00June 8th, 2016|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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Demonstrating compression and tensile forces

By |2022-09-15T12:38:28+02:00June 8th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Demonstrating tension and compression forces

Demonstrating tension and compression forces ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating compression and tensile forces

Aim:  To demonstrate compression and tensional(stretching forces)

Materials: glue, tissue paper, rubber, two small blocks of wood, plastic ruler/rubber hose

Method Demonstrating tension and compression forces. Image credit MediaWiki


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March 2016

The strength of Materials

By |2022-09-15T12:39:50+02:00March 15th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Different materials have different strength. Image credit wisegeek.com

Different materials have different strength. Image credit wisegeek.com ZIMSEC O Level Combined Science Notes: The strength of Materials
  • A beam should be made of stronger material so that it can support a greater load
  • Different materials have different strength
  • Some material is greater when put […]

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The relationship between a beam’s strength and depth

By |2022-09-15T12:39:50+02:00March 15th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

The greater the depth of a beam the more load it can support

The greater the depth of a beam the more load it can support ZIMSEC O Level Combined Science Notes: The relationship between a beam’s strength and depth
  • A beam is stronger if it’s depth if it has greater depth
  • For […]

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Strength to Mass ratio

By |2022-09-15T12:39:51+02:00March 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

The cross section of beams

The cross section of beams ZIMSEC O Level Combined Science Notes: Strength to Mass ratio
  • Engineers do away with materials that are under little stress so as to be able to build efficient structures in terms of weight and cost
  • The material that lies close to the neutral […]

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Loading a beam

By |2022-09-15T12:39:51+02:00March 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Loading a beam

Loading a beam ZIMSEC O Level Combined Science Notes: Loading a beam
  • When a beam is loaded it will bend
  • Bending movement creates stress
  • The top of the beam is compressed and the underside is stretched
  • This is because there are compressive forces at the top and stretching/tensile forces at the underside
  • If […]

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Stress in beams

By |2022-09-15T12:39:52+02:00March 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Types of stresses that affect beams. The arrows show the direction of force.

Types of stresses that affect beams. The arrows show the direction of force. ZIMSEC O Level Combined Science Notes: Stress in beams
  • If a material (beam) is subjected to a force, an equal force acts in the opposite direction
  • This […]

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An introduction to Beams and their types

By |2022-09-15T12:39:57+02:00March 7th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

beams_introduction-min

Common types of beams and their associated forces ZIMSEC O Level Combined Science Notes: An introduction to Beams and their types
  • A beam is any material that is supported so that it can hold a load
  • A simple beam is a length of material e.g steel supported along its length so that […]

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