force, a push or a pull, friction, a force that occurs between the surfaces of two objects that are touching, gravity, a force that pulls objects towards Earth's surface, lubricant, a substance that reduces friction between objects in contact, magnet, a material that applies the force of magnetism, magnetic poles, the places on a magnet where the magnetic force is strongest, motion, the process of an object changing position, oppose, to work against, pull, the application of a force with the intent to move something toward the source of the force, push, the application of a force with the intent to move something away from the source of the force, repel, to push away from, attract, to pull something closer, unbalanced forces, a collection of forces acting on an object that result in a change in the object's motion, at rest, not moving, balanced forces, a collection of forces acting on an object that cancel each other out and produce no change in the object's motion

Investigating Forces

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