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Test yourself: -1. If a toy car travels 6 metres in 2 seconds, how can its speed be calculated?2. A toy car travelling at 10m s-1 slows down to 2m s-1 in 2 seconds. Calculate the acceleration of the toy car.3. A static object takes 5 seconds to reach an acceleration of 15ms-2. What is its final velocity?Measuring velocity and acceleration 1. A variety of methods can be used to determine the velocity and acceleration of a moving object.2. One of the most common techniques is using a ticker timer.3. A ticker timer has a vibrating arm that vibrates with a frequency of 50 Hz and produces a series of dots on a piece of ticker tape that is being dragged along by a moving object.4. When the power is supplied to ticker timer, the vibrating arm will print dots onto a ticker tape attached to a moving object.5. Since the vibrating arm vibrates with a frequency of 50 Hz, it will print 50 dots onto the ticker tape in a second. Hence, the time between two dots (called tick) is 0.02 s.6. The velocity of a moving object such as a moving trolley can be measured by attaching the ticker tape to the trolley.7. When the trolley moves, it pulls the ticker tape through the ticker timer which marks dots on the tape.8. The faster the trolley moves, the further apart the dots marked on the tape.9. The tape is then cut into 10-stick strips and pasted side by side to form a tape chart (Figure 5.12).10. W can then measure the length of the tape to calculate the velocity a

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