Natural Sciences and Technology Grade 5 Term 3: Energy and Change Systems for Moving Things (PPT 1)

Topic 4 Systems for Moving Things Wheels and axles Gr 5 Natural Sciences and Technology – Term 3, Topic 4

Wheels and axles Gr 5 Natural Sciences and Technology – Term 3, Topic 4

What if we did not have wheels? If it was not for the wheel, then cars, trains, farm machines, wagons and nearly all factory and mine equipment would be useless. Gr 5 Natural Sciences and Technology – Term 3, Topic 4

How was the wheel invented? No one knows when and by whom the wheel was invented. The best guess is that this happened in Asia about 10,000 years ago. The oldest wheel known was discovered in Mesopotamia and is believed to date back 55 centuries. Gr 5 Natural Sciences and Technology – Term 3, Topic 4

How was the wheel invented? Heavy loads were moved by carrying them or by using sledges, the backs of animals or by pushing them. Gr 5 Natural Sciences and Technology – Term 3, Topic 4

How was the wheel invented? Wheels were first used on carts because there were no smooth tracks to use. Gr 5 Natural Sciences and Technology – Term 3, Topic 4

Which one of the pushcarts below would you use when walking over patches of grass or on a gravel road? Why? Gr 5 Natural Sciences and Technology – Term 3, Topic 4