**Speed :-**

*Speed is the rate of change of distance.*

##### Velocity :-

* The velocity is the Rate of change of displacement.*

**Acceleration:-**

*The acceleration is the rate of change of the velocity.*

**Newton's Laws:-**

**1st:**Newton's First Law states that every body continues in its state of rest or of uniform motion in a straight line unless acted on by some external force.

**2nd:**Newton's Second Law states that the rate of change of momentum of a body is directly proportional to the external force acting on the body and takes place in the direction of the force.

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**3rd:**If a body A exerts a force on a body B, then B exerts an equal and oppositely directed force on A

**Linear Momentum:-**

*The linear momentum is the product of mass and velocity.*

**Force:-**

*The force is the rate of change of momentum.*

**Conservation of Momentum: -**

*The Conservation of Momentum states that the total (linear) momentum of a system of interacting bodies, on which no external forces are acting, remains constant.*

**Moment of a force:-**

*The moment of a force = force x perpendicular distance from the pivot to the line of action of the force.*

**torque of a couple:-**

*The torque of a couple or a pair of equal and opposite parallel forces lines of action do not coincide is the product of one or the forces and the perpendicular distance between the lines of action.*

**Potential at a point:-**

*The potential at a point is the work done in bringing unit mass from infinity to the point.*

Gravitational field strength:-

Gravitational field strength:-

*The gravitational field strength is the force per unit mass.*

**Charge :-**

**The charge is the property of some elementary particles that give rise to an interaction between them and consequently to the host of the material phenomena described as electrical.**

**Coulombs :-**

*The coulomb is the quantity of charge which passes any section of a conductor in 1 second when a current of 1 Amp is flowing as given by the equation Q = I x A.*

**Volt :-**

*The volt is the potential difference between 2 points in a circuit when 1 J of electrical energy is converted to other form of energy when 1 C passes from 1 point to the other.*

**Resistance :-**

**The resistance is the ratio of Potential Difference across an electrical component to current passing through it.**

**Ohm :-**

*The ohm is the resistance of a conductor through which a current of 1 A is flowing when potential difference across it is 1 V.*

**Electric potential at a point :-**

*The electric potential at a point is the workdone in bringing unit charge from infinity to the point.*

**Capacitance : -**

**The capacitance is the charge stored per unit Potential difference applied to the capacitor.**

**Farad :-**

*The farad is 1 coulomb per volt.*

**Magnetic flux density:-**

**The magnetic flux density is the force per unit length per unit current on a current carrying conductor at the right angle to field lines.**

**Tesla :-**

*A Tesla is one weber of magnetic flux per square meter.*