Is a device used to study the motion of an object for a short period of time

Vibrating steel strip will vibrate 50 times every second and make 50 dots a second on a tape being pulled through

Time interval between 2 consecutive dots ( 1 tick) is 1/50s or 0.02s

To calculate time: No. of tick x 0.02s

. . . .

1 dot1 tick

TEST YOURSELFWhat are the time taken for:

. . . . . .

. . .

. . . . .

Besides time taken ticker timer is also used to determine:

a)Velocityb)Accelerationc)Types of motiond)Distance

HOW TO MEASURE VELOCITY? ACCELERATION?

DETERMINE VELOCITY

How may ticks that you can see?Can you calculate the time taken?What are the distance?Thus:

VELOCITY = DISTANCE UNIT?? TIME TAKEN

. . . . . . . . .

12cm

A B

DETERMINE ACCELERATION

Determine time of 1 partFind initial velocityFind final velocityTotal time = (Total parts - 1) x time of one partACCELERATION = v-u

t

. . . . . . . . . . .

A B C D E F

2cm8 cm

IMPORTANT!!!*To find acceleration: Total time = (Total parts - 1) x time of one part

*To find velocity:Use a normal method without -1 !

TRY THIS!!

Find :a)Accelerationb)Average speed

. . . .

5 cm7 cm6 cm

TYPE OF MOTION

Distance between dot is sameObject moving with constant speed

. . . . . . .Direction of motion

Distance between dot is increasingObject moving faster / accelerate

. . . . . . . . . .Direction of motion

. . . . . . . . . . . . .Direction of motion

The object is _____________________

The object is moving very _______________

…………………………………………….Direction of motion

Ticker timer can be used to determine:

(State 4!)

In the study of linear motion of a trolley on a runway; the time taken for the movement of the trolley is recorded by a ticker timer

TRUE OR FALSE?

Vibrating steel strip will vibrate _________ times in a second

Draw the diagram of ticker tape that shows the object is moving with decreasing velocity