**Forces** are interactions that cause an object to start moving or speed up, stop moving or slow down, change direction, or change shape. There are two main groups of forces: contact and non-contact forces. Contact forces require physical contact between two surfaces, while non-contact forces do not. Examples of contact forces include friction, pushing, and pulling. Examples of non-contact forces include magnetism, static electricity, and gravity.
What is the force applied to the putty in the video?
What is the main cause of magnetism?
What is the force between two objects that have different charges called?
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