These types of forces do not need to have physical contact between the two surfaces to exist. Spring Force: This type of force exists when the spring which is compressed or stretched and gives a reaction force causing compression or stretching. E.g., Force applied by brakes to stop a moving vehicle. Applied Force: This type of force is acted on an object externally, either to create a motion or retard the ongoing motion. E.g., An object falling from sky gets heated due to air resistance on the object. Air resistance Force: This kind of force comes into action when motion of one object in presence of air, such that the air particle opposes the motion of that object, creating a kind of resistance force acting onto the body. Normal Force: This type of force exists when a particular object is placed on some other object, thus the weight of one object acts as a kind of force onto the other stable object. E.g., A block of material freely suspended using some rope and pulley arrangement. Tension Force: This type of force gets transmitted through ropes, wires or cables when some object is suspended or held using them. E.g., Frictional force between the tyre of car and road causing it to wear and tear. Frictional Force: This type of force exists between the two surfaces making contact and having irregularities or roughness between the mating surfaces. These forces act when there exists contact between surfaces or objects and are subdivided as: They can be divided as Contact Forces and Action at a distance type forces. Force is sort of interaction, when the interaction stops between objects, force is considered to be absent. Force is basically a vector quantity which may be either push or pull exerted during interaction of one object with other.
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