Simple machines

A Natural Science video about SIMPLE MACHINES: lever, wedge, wheel and axle, screw, inclined plane and pulley. Other 4th-grade Primary education videos: Light and Heat https://youtu.be/pqdx8D7qraY Forms of energy https://youtu.be/MMUKJCQ_uWo Sources of energy https://youtu.be/hxv2UsPrbQ0 Mixtures https://youtu.be/tiYNPD0HUDU Physical changes https://youtu.be/HkYtSnVDSIg Matter: mass, volume & density https://youtu.be/_gBYnH7dMWU Vertebrate animals https://youtu.be/XrCJf8TaAYs Invertebrates https://youtu.be/SYWQ3mHJ-wA Plant nutrition and respiration: Photosynthesis https://youtu.be/TYH_TS-eatc Plant classification https://youtu.be/R9jkZpJmLoc Food chains and food webs https://youtu.be/hC3NZkUmCFc Elements of ecosystems https://youtu.be/pQOLB71Udow Nutrition https://youtu.be/0IPO2nMHfZ0​ The locomotor system https://youtu.be/bwQ7aLQLEOc​ The five senses https://youtu.be/bg16ZPUyUwo​ Living things and life functions https://youtu.be/9UoD1f7HxmM​ Classification of living things: 5 kingdoms https://youtu.be/7hLMRsBZ78E