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Sunday, 20 January 2013

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?










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