Author: admin
-
What Causes Magnetism
People have known for a long time that a certain type of rock, called lodestone, is a natural magnet. When scientists learned why that is, they also learned how to make other metals into magnets. Magnetism happens when tiny particles called electrons behave in a certain way. All objects in the universe are made up…
-
Introduction
A magnet is a rock or a piece of metal that can pull certain types of metal toward itself. The force of magnets, called magnetism, is a basic force of nature, like electricity and gravity. Magnetism works over a distance. This means that a magnet does not have to be touching an object to pull…
-
Scalars and Vectors-FAQs
1. What do you mean by Scalars and Vectors, in physics? Scalars are the physical quantities that have magnitude or size only. While vectors are the physical quantities that have both magnitude and direction. 2. What are examples of Vectors Quantities? 3. What are some Scalar Quantities? 4. Is Force is a Scalar or a…
-
Parallelogram Law of Vector Addition
This law is just another way of understanding vector addition. This law states that if two vectors acting on the same point are represented by the sides of the parallelogram, then the resultant vector of these vectors is represented by the diagonals of the parallelograms. The figure below shows these two vectors represented on the…
-
Triangle Law of Vector Addition
Consider the vectors given in the figure above. The line PQ represents the vector “p”, and QR represents the vector “q”. The line QR represents the resultant vector. The direction of AC is from A to C. Line AC represents, �⃗+�⃗p+q The magnitude of the resultant vector is given by, ∣�∣2+∣�∣2+2∣�∣∣�∣���(�)∣p∣2+∣q∣2+2∣p∣∣q∣cos(θ) θ represents the…
-
Addition of Vectors
Vectors cannot be added by usual algebraic rules. While adding two vectors, the magnitude and the direction of the vectors must be taken into account. Triangle law is used to add two vectors, the diagram below shows two vectors “a” and “b” and the resultant is calculated after their addition. Vector addition follows commutative property,…
-
Multiplication of Vectors with Scalar
Multiplying a vector a with a constant scalar k gives a vector whose direction is the same but the magnitude is changed by a factor of k. The figure shows the vector after and before it is multiplied by the constant k. In mathematical terms, this can be rewritten as, ∣��⃗∣=�∣�⃗∣∣kv∣=k∣v∣ if k > 1,…
-
Equality of Vectors
Two vectors are considered to be equal when they have the same magnitude and same direction. The figure below shows two vectors that are equal, notice that these vectors are parallel to each other and have the same length. The second part of the figure shows two unequal vectors, which even though have the same…
-
Scalar and Vector Quantity
The differences between Scalar and Vector Quantities are shown in the table added below, Difference Between Scalar and Vector Quantity Scalar Vector Scalar quantities have magnitude or size only. Vector quantities have both magnitude and direction. It is known that every scalar exists in one dimension only. Vector quantities can exist in one, two, or…
-
Vector Notation
Vector notation is a way or notation used to represent a quantity that is a vector, through an arrow (⇢) above its symbol, as shown below: