Inducing a current using a magnet. Image credit youtube.com ZIMSEC O Level Combined Science Notes: Introduction:Motors and generators
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 
A house built using Eco friendly materials. Image credit asiagreenbuildings.com ZIMSEC O Level Combined Science Notes: Factors to consider when choosing construction materials
Wooden pulleys. Image credit wisegeek.com ZIMSEC O Level Combined Science Notes: Machines: Pulleys
Burning food to to test its energy content ZIMSEC O Level Combined Science Notes: Experiment: Food and Energy
Aim: Comparing the energy value of foods
Materials: burners, small containers/beakers to hold the water, food holders, thermometers, different types of starchy and fatty foods
Method
A Zimbabwean family ZIMSEC O Level Combined Science Notes: Reproduction in Humans
Image credit singleblackmale.org ZIMSEC O Level Combined Science Notes: Sexually Transmitted Infections (STIs)
To access more topics go to the Combined Science Notes page
Engineer at work. Image credit ibtimes.com ZIMSEC O Level Business Studies Notes: How managers can use Maslow’s theory of motivation
Workers in a small business startup. Image credit businessinsider.com
ZIMSEC O Level Business Studies Notes: Introduction to organisational structures
Uniformed services usually use an autocratic leadership style
ZIMSEC O Level Business Studies Notes: Autocratic Leadership style