Mechanics (Part – 2)

• Actions like picking, opening, shutting, kicking, hitting, lifting, flicking, pushing, and pulling are often used to describe certain tasks.
• Each of these actions usually results in some kind of change in the state of motion of an object.

The tendency of objects to change their state of rest or motion on their own is called inertia.

Hence option (a) will be the correct answer.

The greater the inertia of an object, the greater the mass of that object

Mass is a measure of inertia of the object, for an object, its inertia would depend on its mass.

Explanation:

• Inertia is the tendency of an object to resist any change in its motion (whether at rest or in motion).

• The greater the mass, the greater the inertia.

  • For example, a truck has more inertia than a bicycle.

• The tendency of an object to resist changes in its state of motion varies with mass.
• Mass is that quantity that is solely dependent upon the inertia of an object.
• The more inertia that an object has, the more mass it has.
• A more massive object has a greater tendency to resist changes in its state of motion.

• When we travel in a moving car, our body remains in a state of rest with respect to the seat. But when the driver applies sudden breaks or stops the car our body tends to continue in the same state of motion because of its inertia.
• Therefore, sudden breaks may cause injury to us by impact or collision, and a safety seat belt in a car exerts a force on our body to make our forward motion slower.

                      2/5MR²

• The motion of the vehicle is also on a straight path.
• Thus, the motion of a vehicle on a straight road is a rectilinear motion.

So in the given graph, the slope is constantly increasing which means that it accelerates constantly after that the slope of the graph becomes constant which means that after some time it moves at a constant speed.