Energy
4th Grade Science · 8 lessons
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Lessons
- 1Gravity and WeightGravity is the force that pulls objects toward each other. On Earth, gravity pulls everything toward the center of the planet, giving objects their weight.Experiment
- 2The Six Simple MachinesSimple machines make work easier by changing the direction or amount of force needed. The six simple machines are lever, pulley, inclined plane, wedge, screw, and wheel and axle.Lesson
- 3Levers 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
- 4Pulleys 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
- 5How 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
- 6What 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
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