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Description
Flashcards by zainab hussein, updated more than 1 year ago
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Created by zainab hussein
over 6 years ago
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| Question | Answer |
| WHAT IS DISTANCES? | Distance is a measurement of how far apart objects are. From one place to another is the distance of something. |
| WHAT IS DISPLACEMENT? | Displacement is a measurement of the change in position of a moving body. A straight line connecting the start and end points specified in terms of length and direction. |
| WHAT IS SPEED? | Speed is a measure of how fast something is moving. When an object moves faster the distance he/she is travelling is covered in a shorter amount of time. |
| WHAT IS AVERAGE SPPED? | Average speed is a measure of how fast an objects moves overall Not including when the object stopped or change in speed. |
| WHAT IS INSTANTANEOUS SPEED? | Instantaneous speed is the speed of an object at a particular moment. |
| DOPPLER EFFECT? | As a car is driving at a high speed, the frequency (number of waves passing each second) will change greatly. That's known as doppler effect. |
| DEVICES USED TO MEASURE SPEED? | 1) Fixed speed cameras 2) Light gates 3) Multi - flash photograph 4) Ticker timer |
| SPEED CAMERAS? | Speed cameras measure the speed of vehicles by measuring the time a vehicle takes to travel from one sensor to another. |
| LIGHT GATES? | Light gates use a sensor to trigger an electric timing mechanism when an object breaks through a light beam. |
| MULTI-FLASH PHOTOGRAPHY? | Multi-flash photography - the spacing between each image represents exactly the same time. |
| TICKER TIME? | Ticker time is a device that could be used to measure speed. When the timer is attached to an object moving in a straight line, dots record its motion. |
| SPEEDING AND DRIVING? | When driving you must be alert and know what you are doing. You must have quick reactions when in need of immediate thinking. |
| REACTION TIME? | The time it takes for someone to react to an emergency is known as their reaction time. For a person who is alert it should take about 0.15-0.30 seconds. |
| REACTION DISTANCE? | While the car is still travelling you must react and think quickly in order to stop/brake in time. Usually it takes a driving 4-8 m until it actually starts braking. |
| DRIVING WHILE BEING DISTRACTED? | To avoid any accident you must be alert, mentally & psychically stable and be focus. Things that distracted you are 1) Use of mobile phone 2) Other people 3) Changing the radio station |
| CALCULATIONS? | 1) From Km/h to m/s must divide by 3.6 and from m/s to Km/h must multiply by 3.6 2) Average speed = Distance travelled divided by time taken |
| DISTANCE-TIME GRAPH? | Distance time graph shows how far an object travels as time progresses. A line with a steep slope means the objects covers a greater distance and is moving faster. The slope is also known as gradient. A flat line on the graph shows the object has stopped. |
| SPEED-TIME GRAPH? | A speed time graph shows how an object's speed changes over time. A OBJECTS SPEED MAY: 1) Be constant (flat line) 2) Increase (graph rising up) 3) Decrease (graph falling downwards) |
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