MOTION:
VELOCITY AND ACCELERATION TICKERTIMER
EXPERIMENT TASK
1AIM:
This activity is about velocity, acceleration, and deceleration,as
influenced by forces of friction and gravitation. And you will be introduced
to a device called a tickertimer. At
the end of the activity, the learner should be able to:  Describe
how friction compensation happens on a runway.
 Describe
how a tickertimer works.
 Describe
the experimental procedures to measure the velocity of a trolley.
 Identify
tickertimer tapes that show uniform velocity and those that show accelerated
motion.
 Calculate
velocity from a ticker tape.
 Determine
acceleration due to gravity using a tickertimer.
APPARATUS: To
set up this activity, the following equipment is needed: Trolleys, runways, tickertimers,
ticker tapes, and rulers. PROCEDURES:
 Set up the trolley
to move on a horizontal runaway as shown in figure below (under the guidance of
your teacher). A ticker tape passing through the ticker timer is attached to the
trolley.
 Observe
and describe how the trolley moves along the runaway.
 Suggest
how the trolley can be made to moves down the runway at a constant speed.
 Ask
your teacher to help you produce various tapes for constant velocity and accelerated
motion.
 Examine
the various tapes obtained
 Describe the various
tapes that show uniform velocity and those showing accelerated motion.
 Tape
(take initial part of the tape to be on the left)  Describe
in each case how spacing between dots varies  Describe
the type of motion represented  A    
B    
C    
D    
E    
TASK
2 DETERMINING
VELOCITY FROM THE TICKER TAPE Answer the
following questions:  If
the frequency of the ticker timer is f, what is the time interval between
two successive dots?.
 If
frequency of the ticker timer is 50Hz, what is the time interval for the following
cases:
 From
the 1st to the 2nd dot;
 From
the 1st to the 5th dot;
 From
the 1st to the 100th dot;
The
following examples show various tapes each of length 8cm obtained using a ticker
timer of frequency 50Hz. In each case find the time interval of the tape and
the velocity in ms1.
 Tape  Time
interval  Velocity
 A    
B    
C    
   
TASK
3 DETERMINING
ACCELERATION FROM THE TICKER TAPE  Set
up the experiment and produce a number of ticker tapes using a trolley running
on an inclined runway.
 Discuss
how to choose the interval for the initial and final velocities on the accelerated
tape.
 Discuss
why the initial dots could be ignored (cut off).
 Calculate
initial and final velocities on the accelerated tapes.
 Discuss
how to obtain the time taken to change from initial to final velocity.
 Calculate
acceleration on the accelerated tapes.
Calculate
acceleration for the tapes below, in the steps given. Take frequency f = 50Hz
 
 A  The
distance x = 18cm The distance y = 30cm  Time
for initial interval x or final interval y, t/s  
Initial
velocity, u/ms1  
Final
velocity, v/ms1  
Time
to change from average velocity u to average velocity v, T/s  
Acceleration,
a  
B 
The distance x = 14cm The distance y = 24cm
 Time,
t  
Initial
velocity, u  
Final
velocity, v  
Time,
T  
Acceleration,
a  
TASK
4 DETERMINING
ACCELERATION DUE TO GRAVITY USING THE TICKER TIMER  Discuss
the set up of the experiment.
 Set
up the experiment as shown in diagram and produce a number of ticker tapes.
 Use
the method of finding acceleration (from above) to determine the acceleration
due to gravity.

 Time
for initial interval x or final interval y, t/s  
Initial
velocity, u  
Final
velocity, v  
Time
to change from average velocity u to average velocity v, T/s  
Acceleration,
a  
Review
your understanding ITEM
1
 Tape
 Describe
in each case how spacing between dots varies  Describe
the type of motion represented  A    
B    
C    
D    
E    
ITEM
2 The
following examples show various tapes each of length 8cm got using a ticker timer
of frequency 50Hz. In each case find the time interval and the time interval
of the tape and the velocity in ms1.
 Tape  Time
interval  Velocity
 A    
B    
C    

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