Simple Electricity
3rd Grade Science · 5 lessons
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Lessons
- 1The 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
- 2Inclined Planes and RampsAn inclined plane is a flat, slanted surface, like a ramp, that makes lifting easier. Pushing a load up a gentle slope takes less force than lifting it straight up, though you must move it a longer distance.Experiment
- 3Light and ReflectionLight travels in straight lines until it hits a surface and bounces off, which is called reflection. A smooth mirror reflects light evenly so you see a clear image, while a rough surface scatters the light in many directions.Lesson
- 4Making a Circuit Light UpA bulb lights only when there is a complete loop from one end of the cell, through the bulb, and back to the other end. Break the loop anywhere — a gap, a switch, a loose wire — and everything stops, not just the part after the break.Experiment
- 5Gravity Pulls Everything the Same WayGravity pulls every object towards the centre of the Earth, which is why "down" points to a different direction in Australia than in Canada. It acts on everything with mass, whether the object is moving, still, or falling.Experiment
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