Podcast
Questions and Answers
What is the unit of speed in the speedometer shown in Fig. 13.7?
What is the unit of speed in the speedometer shown in Fig. 13.7?
If a car travels at a speed of 40 km/h, how long will it take to cover a distance of 120 km?
If a car travels at a speed of 40 km/h, how long will it take to cover a distance of 120 km?
Which of the following is an example of speed in everyday life?
Which of the following is an example of speed in everyday life?
What is the speed of a falcon in m/s, according to Table 13.4?
What is the speed of a falcon in m/s, according to Table 13.4?
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What is the factor that affects the speed of an object, according to the content?
What is the factor that affects the speed of an object, according to the content?
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What type of speed is represented by the speed of a blue fish in Table 13.4?
What type of speed is represented by the speed of a blue fish in Table 13.4?
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What determines which object is moving the fastest?
What determines which object is moving the fastest?
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What is the unit of speed that is commonly used?
What is the unit of speed that is commonly used?
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What is used to calculate speed?
What is used to calculate speed?
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What factor affects the speed of an object?
What factor affects the speed of an object?
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Where is speed commonly experienced in everyday life?
Where is speed commonly experienced in everyday life?
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What is the motion of the earth around the sun an example of?
What is the motion of the earth around the sun an example of?
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Why can you decide whose speed is the highest?
Why can you decide whose speed is the highest?
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What is the term for the amount of distance covered in a given interval of time?
What is the term for the amount of distance covered in a given interval of time?
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What is the speed of the car if it covers a total distance of 200 km in 4 hours?
What is the speed of the car if it covers a total distance of 200 km in 4 hours?
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Why do we usually calculate the average speed of a car?
Why do we usually calculate the average speed of a car?
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What is the unit of speed in the statement 'the car has a speed of 50 kilometres per hour'?
What is the unit of speed in the statement 'the car has a speed of 50 kilometres per hour'?
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Why do we need to measure intervals of time that are much shorter than a day?
Why do we need to measure intervals of time that are much shorter than a day?
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What is the formula to calculate speed?
What is the formula to calculate speed?
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What is the term used for the time taken by the earth to complete one revolution of the sun?
What is the term used for the time taken by the earth to complete one revolution of the sun?
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What is the term used for the time between one sunrise and the next?
What is the term used for the time between one sunrise and the next?
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Why do clocks or watches measure time?
Why do clocks or watches measure time?
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Study Notes
Motion and Speed
- Motion refers to the change in position of an object with respect to time and its surroundings.
- Examples of motion include a pedal of a bicycle, the earth moving around the sun, a swing, and a pendulum.
Measuring Speed
- Speed is the distance covered by an object in a given interval of time.
- To calculate speed, we divide the total distance covered by the total time taken.
- Speed = Total Distance Covered ÷ Total Time Taken
- Distance covered = Speed × Time
Understanding Speed
- In everyday life, objects rarely move with a constant speed over long distances or for long durations of time.
- The speed calculated is actually the average speed of the object.
- When we say an object has a speed of 50 km/h, we usually mean the total distance covered by it in one hour, regardless of whether it moved with a constant speed or not.
Measuring Time
- Clocks and watches are common time-measuring devices used to measure intervals of time that are much shorter than a day.
- The dashboard of a car, bus, or other vehicle often has a speedometer that records the speed in km/h.
Speed of Different Animals
- The table below shows the fastest speed that some animals can attain:
- Falcon: 320 km/h (320 × 10^0 m/s)
- Cheetah: 112 km/h
- Blue fish: 40-46 km/h
- Rabbit: 56 km/h
- Squirrel: 19 km/h
- Domestic mouse: 11 km/h
- Human: 40 km/h
- Giant tortoise: 0.27 km/h
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Description
Quiz about motion and speed, comparing the speed of different objects and understanding the concept of motion.
