What Are Forces and Motion?

The spoken lesson

"Motion means an object changes position over time. We can describe its speed, direction, and rotation. A force is an interaction that can change motion or shape. A hand may push or pull through contact. Gravity and magnetism can act without direct contact. When forces balance, an object's motion does not change. When the combined force is unbalanced, an object may start, stop, speed up, slow down, or turn. Forces can also stretch, compress, or bend materials. Friction and air resistance often slow moving objects. Forces are pushes, pulls, and other interactions that can change motion or shape." DESIGN REQUIREMENTS: Use slow safe movement and visible reference points. Avoid collision games, heavy objects, projectiles, force competitions, or incorrect "force is stored inside moving things" imagery.