Kinematics Terminologies - Practice Questions & MCQ

• Kinematics- In kinematics, we study ways to describe motion without going into the causes of motion.

• Important terms

1. Rest-A body is said to be at rest if it does not change its position with respect to its surroundings with the passage of time.

              e.g: A book lying on the table.

       2. Motion- Motion is known as a change in the position of an object with time.

                 e.g  A moving bus.

• Note= Rest and motion are relative to each other.

               e.g   All passengers sitting inside the moving bus are at rest with respect to one another. 

                    But all appear to be in motion to a man standing outside the bus.

• Types of Motion

        There are three types of motion.

             I.  One Dimensional (1-D)-

•  If only one coordinate is used to describe the motion of an object.
•  Motion is a straight line is 1-D.
•  E.g: Train running on singletrack, Apple falling from a tree

           II.   Two Dimensional (2-D)-

•  When two coordinates are used to describe the motion of an object.
•  Motion in-plane is 2-D.
•  E.g Earth revolves around the sun.

          III. Three Dimensional -

• When all three coordinates are used to describe the motion of an object.
• Motion in space is 3-D.
• e.g: object moving in space. 

3.  Reference point-  

• For measuring the position(or location) of an object we need a reference point.
• Origin(O) of a rectangular coordinate system can be taken as a reference point