Forces and Motion
3rd Grade Science · 6 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
- 2Friction Opposes MotionFriction is a force that opposes motion between surfaces that touch. Rough surfaces create more friction than smooth ones. Without friction, you could not walk or grip objects.Experiment
- 3Balanced and Unbalanced ForcesBalanced forces are equal in size and opposite in direction, so an object stays still or moves at constant speed. Unbalanced forces cause an object to accelerate or change direction.Experiment
- 4Forces: Push or PullA force is a push or pull that can change an object's motion, shape, or direction. Forces are measured in Newtons and can act through contact or at a distance.Experiment
- 5Conductors and InsulatorsMetals let current pass because their electrons can move; plastic, wood, glass and rubber do not. That is exactly why wires are copper inside and plastic outside — one carries the current, the other keeps it where it belongs.Experiment
- 6Weight Changes, Mass Does NotMass is how much stuff there is and never changes. Weight is the pull of gravity on that mass, so the same lunchbox weighs less on the Moon and would weigh more on Jupiter, while its mass stays exactly the same.Experiment
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