Question

What type of motion do the vehicles on a straight road perform?

Answer 1

Hint: An object is said to be in motion, if its position changes with time. A vehicle moving on a straight road changes its position every second, hence we can infer that the vehicle is in motion. Usually the motion of the bodies is categorized into two. One is the rectilinear motion and the other is the periodic motion. The word rectilinear has a word line in it. Therefore we can come to a conclusion about what kind of motion the vehicles on a straight road perform.

Complete answer:
The rectilinear motion is the type of motion where the body traces a linear straight path. The periodic motion is the type of motion where in the body traces the same path in the same interval of time.
In the above question it is given to us that vehicles go in a straight road. Hence the type of motion it performs is rectilinear motion.

Note:
It is to be noted that the motion of the bodies or the objects is always relative. Let us say an observer observes the car going along a straight road. He will say that the people in the car are moving. Now let us say there are two passengers in the car. They will say that both of them are at rest. For motion to be observed the relative velocity of both the bodies should be zero. That is they should travel with the same velocity and in the same direction.