Forces
7th Grade Science · 6 lessons
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Lessons
- 1Newton's Second Law: F = maNewton's second law says that force equals mass times acceleration (F = ma). A heavier object needs more force to accelerate at the same rate as a lighter one.Experiment
- 2Speed, Velocity, and AccelerationSpeed measures how fast an object moves (distance divided by time). Velocity includes both speed and direction. An object changing direction is accelerating even at constant speed.Experiment
- 3What Counts as Work?Work in science means using a force to move an object a distance. If you push a box across the floor, you do work. If you push a wall and it doesn't move, no work is done.Experiment
- 4Buoyancy and FloatingBuoyancy is the upward force a fluid pushes on an object placed in it. An object floats when the buoyant force pushing up equals the weight pulling down, which is why a heavy steel ship can float while a small pebble sinks.Experiment
- 5Center of Gravity and BalanceThe center of gravity is the point where an object's weight is evenly balanced. An object stays steady when its center of gravity sits above its base, but it tips over once that point moves past the edge.Experiment
- 6Terminal VelocityTerminal velocity is the steady top speed a falling object reaches when air resistance pushing up equals gravity pulling down. Once these forces balance, a skydiver stops speeding up and falls at a constant rate.Experiment
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