Welcome to Interactive Science

Interactive Science is really important for kids to explore and see things in action before they could start learning them for exams. Without interactive science and simulations, it's q quite demanding task to explain students and especially kids how to do all those things in their syllabus actually work in real life, how important are interactives, why and how they work, everything we are going to discuss at this website.
This interactive site deals with different kind of educational resources for students and teachers. It has a collection of science simulations that can help teachers to explain things to their students in a more comprehensive way. Interactive science also contains notes of different subjects for Azad Jammu and Kashmir students who study course of Mirpur Board AJK. 

A database of science simulations includes stuff related to "Physics", "Chemistry", "Maths" and "Biology".

Our mission is to explain things clearly to our students and get them caught up at the topics that have been a bug over the years now. It's because we've been cutting corners and love relying on theories just rather than concepts, that sounds quite odd.So let's just stop clowning around and make sure we've both feet on the ground by analyzing things and drawing mental road-maps in light of theories. Interactive science can really work wonder. Anyone who has had a tough time understanding concepts behinds the topics of mentioned subjects can take help from the blog. Interactives at different topics provide you simulations where you can perform things and see them working.

Thanks for visiting our blog and do let us know if you want anything that you want us to change. We'll always appreciate your contribution. At the same time, if you find anything interesting then make sure to share with other guys too via social networks.

See also

• Biology Interactives
• Chemistry Interactives
• Physics Interactives
• Mathematis Interactives
• 10th class solved notes
• 9th class solved notes

How to draw Free body diagram

Free body diagram is a graphical way of depicting various forces acting on a body in a certain scenario. A free body diagram shows how much is the force acting on the body under consideration i.e. magnitude of forces acting on that object and also the direction of those forces.

Suppose you are trying to drag a desk through your classroom. Then how many forces acting on a body in a static state can be depicted easily by a free body diagram.

How to draw free body diagram

To draw free body diagram, as the name reveals, we do not need to figure a whole body under the action of forces. We can just draw a square or a box in place of the body and then draw arrows from the center of the square keeping in view the direction and magnitude of forces acting on a body under consideration. The size of the arrows represents the magnitude of the forces where the direction of arrows represents the direction of forces acting on a body. Suppose you are asked to draw a free body diagram of the situation (dragging desk) described above, then all you need is to draw a square or a box and then draw vectors through from the center of the box outward depending on the number of forces acting on the body. We know that there are four forces acting on our body we are trying to drag; weight, normal force, applied force and friction force. All these forces can be depicted by free body diagram as shown below

Here I’m not going to discuss how these forces act on our body when we try to drag a body down the floor. There is no restriction over how many forces you need to draw in free body diagram, it all depends on the situation under discussion. For example, when you are standing on the ground, there are only two forces acting upon you; one is the force of gravity which tries to pull you down and the normal reaction forces which exactly equals to your weight due to gravity (that’s why you are stable on the ground). In this situation, only two forces need to be shown in our free body diagram.

Now imagine a situation when a body accelerates rightward under the action of applied force. In this scenario, the frictional force can no more balance the applied force. And we can draw the free body diagram as given below

It can easily be understood from the free body diagram that the body under consideration is accelerating rightward while the weight of the body has been canceled by the normal force. The purpose of describing the physics behind the figure is to show the size of arrows, rightward and leftward arrows are not equal in size.

Similarly, we can come across a situation where any body gets under the action of one force only. A book is free falling from your hand and accelerating towards the ground is under the action of one force only and its free diagram is

In this way, you can draw free body diagram of any body under consideration.The most important thing is to disclose all the forces acting on a body on free body diagram and for that purpose, it is essential to have knowledge of different types of forces.

What is a force?

What is a force? If you’ve placed a pencil at a table, do you think it will ever move on its own? For a moment, if we ignore surface friction, air pressure and gravity and then we set the pencil in motion; do you think it will ever come to rest on its own? Well, answer to both the question is NO. In the previous one, the pencil can move, accelerate rather I’d say, only when some unbalanced force is applied to it. And in the second example, the pencil will not come to rest ever provided that applied by some unbalanced force. This is what we’ve learned from Newton’s First Law of Motion. Therefore force can be defined as:

Force is an agent which tends to produce a change in the state of rest or of uniform motion of an object. It creates an acceleration in a body. We can also say it is a push or a pull of one object on another when both objects interact with each other. When two objects interact, then a force acts upon each of the objects and when there is no interaction, objects do not feel any kind of interaction, Interaction is the vital thing for the existence of forces.

One thing you must always make sure that force doesn’t produce motion, it creates acceleration only.

Types of forces

There are two types of forces on a broad scale.

• Contact Forces
• Non-contact Forces (Action-at-a-distance forces)

Contact Forces:

Contact forces are those types of forces when two bodies interacting with each other physically come in contact with each other. They act through a point of contact between two interacting bodies and this contact could be momentarily in the shape of impulse or continue for some period of time. For example, if a boy kicks a football, then the boy is applying force on the football by coming in physical contact with the football. Examples of contact forces include applied forces, frictional forces, normal forces, air resistance forces and tensional forces.

Applied Forces

Applied force is a force that is applied by one object on another. If a boy is pulling a cart through the floor and he is applying a force on the cart to accelerate it and this force is applied force.

Frictional Force

The frictional force is a force that comes into play two bodies are sliding over one another and its purpose is to oppose the motion. This force is applied by the surface over which an object moves or try to move. Because every surface has some kind of roughness in the shape of bumps and ridges, therefore, when these microscopic peaks and valley come in contact with each other they try to hinder the motion of an object due to intermolecular attractive forces between molecules of different surfaces.

Normal Force

The normal force also called a support force, is a force which supports the weight of a body on a supporting surface. This force is always equal in magnitude and opposite in direction to the weight of an object. We are standing on the ground, our weight is acting downward, and an equal force acting upward to support our weight is the Normal force.

Tension Force

The tension force is a force that acts along a string or cable which it is being pulled by forces acting from its opposite ends. For example, if we attach a weight at one end of a string and hang it somewhere, then the force that acts along in the string in the direction opposite to the weight is tension force. If this force gets equal to weight then the body gets in equilibrium.

Air resistance

Air resistance is a force that opposes the motion of an object when it tries to move through the air. Although it is quite noticeable for objects traveling at a very high speed, yet its magnitude is negligible in everyday life

Non-contact Forces (Action-at-a-distance forces)

These are the type of forces between two interacting objects when they do not come in physical contact with each other. Non-contact forces include gravitational forces- which is a force of attraction between two bodies having mass, electric forces-force of attraction between the nucleus and revolving electrons in orbits, and magnetic forces which are attractive or repulsive forces between two magnets separated by some distance.

The Newton (unit of force)

Force is a measurable quantity and every measurable quantity has a unit. Force is measured using a standard metric unit called the Newton (N). And one Newton is defined as the amount of force required to produce an acceleration of one meter per second in a body of mass one kilogram. Mathematically it is stated as

1 Newton = 1 kg • m/s2