Angle between two vectors: The angle between two vectors a and b is determined from the definition of dot product,that is: If θ = 0 or π then the vectors a and b are collinear. If θ = 90 then the vectors a and b will be perpendicular to each other. Example:Find the angle between the vectors. a = 2 i –j ...

Read More »## Properties of vectors

What is a vector ? Types of vectors Vectors scalar product Vector cross product How to find angle between two vectors? Vectors,both in plane and in space have following properties: Let u ,v and w be vectors in the plane or in space and let a,b ∈ R then they have the following properties: Commutative property u + v = v ...

Read More »## What is a vector ?

Difference between vector and scalar Vector scalar or Dot product Vector cross product Properties of vectors How to find angle between vectors? Types of vector What is vector in physics? Vector is defined as”The physical quantity which has magnitude and direction is called vector.”There are some physical quantities which required magnitude as well as direction for their complete description,such as ...

Read More »## Difference between electric potential and electric potential energy

Electric potential: “Electric potential at a point in electric field is the amount of work done to bring the unit positive charge from infinity to that point.” The gravitational potential at point in the gravitational field is the gravitational potential energy of a unit mass placed at that point.In this way ,the electric potential at any point in the electric ...

Read More »## Difference between centripetal and centrifugal force

Centripetal force: “The force which is directed towards the centre of circle is called centripetal force.” Explanation: Consider a body moving with uniform speed in a circular path.In this case velocity changes only in direction and not in magnitude.Applying Newton’s first law of motion we find that some external force must be acting on the particle.Without presence of external force ...

Read More »## Difference between mass and weight

Unfortunately,weight and mass are often considered to be same quantities and misused in daily conversations.It is therefore essential for you to differentiate between these two physical quantities. Weight and mass difference: Properties of mass: Mass is the quantity of matter possessed by a body. It is a scalar quantity,which has magnitude only. Its unit is kilogram (kg). It is not ...

Read More »## Acceleration due to gravity formula and problems

What is gravitational acceleration? Acceleration of a freely falling bodies is called gravitational acceleration.The value of gravitational acceleration is 10 ms-². Why value of g varies with altitude? Above formula shows that the value of acceleration due to gravity g depends on the radius of the earth at its surface.The value of g is inversely proportional to the square ...

Read More »## What is the law of conservation of enegy

What does law of conservation of energy mean? According to law of conservation of energy:”Energy can neither be created nor is it destroyed.It can only be transformed from one form to another.A loss in one form of energy is accompanied by an equal increase in the other forms of energy.The total energy remains constant.” According to Einstein’s mass energy relation: ...

Read More »## Different types of motion and examples in physics

Definition of motion in physics: “A body is said to be in motion,if it changes its position with respect to its surroundings.” Surroundings are the places in its neighborhood where various objects are present.The state of rest or motion of a body is relative.For example,a passenger sitting in a moving bus is at rest because he is not changing his ...

Read More »## Moment of inertia units

Moment of inertia: Moment of inertia is defined as:”The sum of the products of the mass of each particle of the body and square of its perpendicular distance from axis.”For a rigid body moving about a fixed axis,the laws of motion have the same form as those of rectilinear motion,with moment of inertia replacing mass,angular replacing linear velocity,angular momentum replacing ...

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