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Grade 4 Science · World 9: Machine Workshop · Level 58
Pulleys and Wheels and Axles
Explain how a flagpole pulley changes direction and a doorknob makes turning easier.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 58
- A pulley is a wheel with a rope around it. Pull the rope down, and the load goes up.
- A flagpole has a pulley at the top. It doesn't make the flag lighter. It changes the direction of your pull, so you can raise the flag from the ground.
- A wheel and axle is a large wheel joined to a rod called an axle, and the two turn together.
- A doorknob is a wheel and axle. Your hand turns the wide knob easily, and that turns the thin rod inside the door.
Georgia Standards of Excellence in Science:
- S4P3.c — Ask questions to identify and explain the uses of simple machines (lever, pulley, wedge, inclined plane, wheel and axle, and screw) and how forces are changed when simple machines are used to complete tasks. (Clarification statement: The use of mathematical formulas is not expected.)