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# Physics Definitions

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1. Force is a physical cause which changes or tends to change the shape or size or state of rest or state of motion of a body. 2. Force (F = ma) (Vector) Contact force 3. Non-Contact force Forces experienced by bodies without being physically touched. 4. Gravitational force Each particle in the universe attracts each other by a force due to its mass which is called as Gravitational force. 5. Force of gravity or Weight of body The force on a body due to earth s attraction. 6. Electro static force The two like charges repel while 2 unlike charges attract each other. The force between the charges is called as Electro static force 7. Magnetic force 8. General character of non-contact force 9. Newton s 1st law of motion 2 like magnetic poles repel while 2 unlike magnetic poles attract each other. The force between magnetic poles is called as Magnetic force Gravitational force is always attractive in nature while electro static force and magnetic force can be either attractive or repulsive. The magnitude of non-contact force is inversely proportional to square of distance of separation between 2 bodies. A body continues to be in a state of rest or in a state of motion unless an external force is applied on it. 10. Newton s 2nd law of motion F= p/ t Rate of change of momentum is directly proportional to the force applied and this change in momentum takes place in the direction of applied force. 11. Newton s 3rd law of motion Every action has an equal and opposite reaction. 12. Inertia (directly proportional to mass) SI unit is kg m/s Linear momentum (p = mv) (vector qty) Inherent property of a body to resist the change in state of rest or state of motion of body. One dyne (1 dyne=1g x 1cm/sec sq) One Newton (1 newton = 1 kg x 1 m/sec sq) One Kilogram force (9.8 N) One dyne is the force applied on a body of mass one gram to produce an acceleration of 1 cm/sec. sq One Gram force (980 dyne) Force of gravity on a mass of 1 Gram. 13. 14. 15. 16. 17. Forces which are applied on body by making a physical contact. The momentum of body in linear motion is the product of its mass and velocity. One newton is the force applied on a body of mass one kilogram to produce an acceleration of 1 m/sec. sq Force of gravity on a mass of 1 Kg.

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