## VR Tour For Std. 9 Ch. 9. Force and Laws of Motion

#### What's Included in Virtual tour of this chapter

Force is a collision to an object, if unopposed will change the momentum of an object. We will understand the Balanced and Unbalanced forces. The first law of motion stated that objects move at a constant speed when no force acts on them. The second law states that the acceleration of an object is dependent upon two variables- the net force acting upon the object, and, the mass of the object. For every action, there is an equal and opposite reaction, well we will understand this through the third law of motion.

#### Virtual tour 1: Balanced and Unbalanced forces

If two individual forces are of equal size or strength and opposite direction, then the forces are said to be balanced. An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal strength and in the opposite direction.

#### Virtual tour 2: The First law of motion

In this virtual tour, we will study Newton’s first law. It states that, if an object is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is pushed upon by a force.

#### Virtual tour 3: Inertia and mass

Do we know what inertia is? Well, Inertia is the resistance, of any physical object, to any change in its velocity. The mass of an object is a measure of its inertia. That is the very reason why Heavy objects are difficult to move than lightweight objects because the former has more inertia.

#### Virtual tour 4: The Second law of motion

Have you ever wondered what happens if two objects collide with unequal mass, and, momentum? The second law of motion, states that the rate of, change of momentum, of an object, is proportional to the applied unbalanced force, in the direction of the force.

#### Virtual tour 5: The Third law of motion

For every action, there is an equal and opposite reaction. The third law of motion, states that, when one object exerts a force, on another object, the second object instantaneously exerts, a force, back on the first. These two forces are always equal in magnitude, but opposite in direction.

#### Virtual tour 6: Conservation of momentum

The Law of conservation of momentum states that if no external force is exerted on the system the momentum of the system must remain constant. Momentum is a multiplication of mass and velocity of the object. Therefore, momentum can neither be created nor destroyed.