Energy
7th Grade Science · 7 lessons
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Lessons
- 1Newton's First Law: InertiaNewton's first law states that an object at rest stays at rest and an object in motion stays in motion unless acted on by an unbalanced force. This is called inertia.Experiment
- 2Newton's Third Law: Action and ReactionNewton's third law states that for every action there is an equal and opposite reaction. When you push against a wall, the wall pushes back on you with the same force.Experiment
- 3Momentum in MotionMomentum is mass times velocity. A heavy truck moving slowly can have the same momentum as a light car moving fast. Momentum is conserved in collisions.Lesson
- 4Air Resistance and DragAir resistance, also called drag, is a force that pushes against objects moving through the air. A falling feather drifts down slowly because air resistance acts on its wide surface, while a compact stone meets less drag and falls faster.Experiment
- 5Pressure and AreaPressure is the amount of force pushing on a certain area. Spreading a force over a larger area lowers the pressure, which is why wide snowshoes keep you from sinking while a sharp, thin blade cuts easily.Experiment
- 6Springs and Elastic ForceA spring pushes or pulls back with an elastic force when it is stretched or squeezed. The more you stretch a spring, the stronger it pulls back, which is how spring scales weigh objects and trampolines bounce you upward.Experiment
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