Magnets
3rd Grade Science · 5 lessons
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Lessons
- 1Levers and FulcrumsA lever is a rigid bar that rotates around a fixed point called a fulcrum. Seesaws, scissors, and bottle openers are all examples of levers that multiply force.Experiment
- 2Pulleys Lift LoadsA pulley is a grooved wheel that holds a rope and lets you change the direction of a force. Pulling down on one side lifts a load on the other, and combining several pulleys makes heavy objects far easier to raise.Experiment
- 3How Sound Waves TravelSound is a wave made by vibrations that travel through a material such as air, water, or metal. The vibrations bump particles into one another to carry energy to your ears, which is why sound cannot travel through empty space.Experiment
- 4What Magnets Do and Do Not AttractMagnets attract iron, steel, nickel and cobalt. They do not attract aluminium, copper, gold, plastic or wood — so most coins, drinks cans and kitchen foil are not magnetic, even though they look metallic.Experiment
- 5Magnetic Force Works at a DistanceA magnet pulls on iron without touching it, and the pull gets rapidly weaker as the gap grows. It also works straight through paper, plastic and wood, because those materials do not block a magnetic field.Experiment
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