Question

A moving vehicle on a straight road is an example of:
A. Rotary motion
B. Vibratory motion
C. Periodic motion
D. Rectilinear motion

Answer 1

Recall the basics of all different types of motion of an object on different paths. Give the definitions of all types of motion given in the options and conditions for an object to have that type of motion during its travel. Hence, check that a moving vehicle on a straight road fits in which of the types of motion and choose the correct option.

Complete answer:
We have given that a vehicle is moving on a straight road. We have asked to determine the type of motion of the vehicle.The rotary motion of an object is its motion on the circular and not the straight path. Thus, the motion of a vehicle on a straight road is not a rotary motion.Hence, the option A is incorrect.

The vibratory motion of an object is the motion of the object in to and fro form. The particle moves on the same path again and again. Thus, the motion of a vehicle on a straight road is not a vibratory motion.Hence, option B is incorrect.The periodic motion of an object is any repeated motion of the object on the same path. Thus, the motion of vehicles on a straight road is not a periodic motion.Hence, the option C is incorrect.

The rectilinear motion of an object is the motion in which the object moves on a straight linear path with the direction of displacement and velocity in the same direction.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.

Hence, the correct option is D.

Note: The students may think that the wheels of the vehicle moving on the road are performing circular motion or rotary motion. Hence, the motion of the vehicle on the straight road must be rotary motion. But the students should keep in mind that we have asked the motion of the vehicle as a whole and the motion of the vehicle as a whole is linear (rectilinear motion) on the straight road and not rotary motion.