Force is defined as any interaction capable of moving an object at rest or of changing the speed or direction of an object in motion. To measure force, the dynamometer is used and the unit of measurement is the newton. The forces are applied by contact between objects or without it, as occurs with magnetism. This infographic from the Ábaco collection is included in the Science for all series, which also includes those entitled: Movement, Gravity, Pressure and Radioactivity.