2.1 : Linear Motion :     Motion along a straight line.

1.  Distance The distance travelled by an object is the ______________ that is traveled by that object. Distance is a ________________. The SI unit of distance is ___________ .

2.  Displacement Displacement of an object from a point of reference, O is the _____________ of the object from point O in a _____________ direction. Displacement is a _____________ quantity. The SI unit of displacement is _______________.

Distance	Displacement
Total path length travelled from one location to another	The distance between two location measured along the ______________ path connecting them in specific location
Scalar quantity	Vector quantity
Has magnitude only	Has magnitude and direction
SI unit meter	SI unit meter

   Speed

1.      Speed is defined as the …………………… travelled in a certain interval of time or the …………………............ of distance traveled with time.

                                         Speed = Distance traveled

                                                             Time taken

2.      The speed of an object is a ……………………… quantity. The SI units for speed is …………………..

 Velocity

1.      Velocity is defined as the …………………….. travelled in a given  interval of time in a ………………………………….. or the rate of change of …………………….. traveled with time.

                                         Velocity = Displacement

                                                            Time take

2.      The velocity of an object is a …………………….. quantity. The SI units for speed is ………………..

Acceleration

1.      Acceleration is defined as the rate of change of velocity.

                                   Acceleration = Change of velocity

                                                               Time taken

                                                     a = v - u

                                                              t

                                                     v - the final velocity

                                                     u – the initial velocity

                                                     t – the time taken

1.      The ticker timer as shown  in figure is used in the laboratory to study motion.

2.      It can print dots on a tape at a steady rate.

3.      It is connected to an a.c . power supply of 50 Hz.

4.      The time taken to make 50 dots on the ticker tape is 1 s. Hence , the time interval between 2 consecutive dots ( 1 tick) is 1/50 = 0.02 s.

Calculation involved ticker tape :

What is the speed of the trolley ?

The ticker-tape charts constructed with 5-tick lengths is shown in the Figure  above. What is the velocity of the trolley if the ticker-timer was connected to a 50 Hz power supply?