Books 

• Laboratory Manual at Upper Primary Stage Science Class VI – VIII (Activity 37)
• NCERT Science Textbook - Class VIII (Chapter 11: Force and Pressure)

Websites

• https://ncert.nic.in/pdf/school-kit/LMUPS_Science.pdf (Activity 37, Page No: 126)
• https://smartclass4kids.com/science/physics/force/  
• https://k8schoollessons.com/forces-and-motion/  
• https://www.generationgenius.com/balanced-and-unbalanced-forces-for-kids/  
• https://www.ducksters.com/science/physics/force.php  
• https://mocomi.com/types-of-forces/  
• https://kids.britannica.com/kids/article/force/400287  
• https://www.twinkl.co.in/teaching-wiki/force  
• https://innovationkidslab.com/force-and-motion-steam-activities-for-kids/