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Contact & Non-Contact Forces are explained here.
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force • A force is any interaction that, when unopposed, will change the motion of an object. • Force can cause change in motion of a body. • Force can cause change in form of a body.
Contact force • A force is seen to act through a direct contact of the objects or via one more object such a force is called ‘Contact force’. • Contact is must in this case.
Contact forces in nature • Frictional force • Punching action • Muscular force
Non-contact force • A force is applied between two objects even if the two objects are not in contact; such a force is called a ‘Non contact force’. • No contact is required in this case.
Non-contact forces in nature • Gravitational Force • Magnetic Force • Nuclear Force • Attraction & Repulsion