22 Questions
What is the unit of speed in the speedometer shown in Fig. 13.7?
km/h
If a car travels at a speed of 40 km/h, how long will it take to cover a distance of 120 km?
4 hours
Which of the following is an example of speed in everyday life?
A car moving on a highway
What is the speed of a falcon in m/s, according to Table 13.4?
89 m/s
What is the factor that affects the speed of an object, according to the content?
None of the above
What type of speed is represented by the speed of a blue fish in Table 13.4?
Speed of an animal
What determines which object is moving the fastest?
The distance moved by the object in a given interval of time
What is the unit of speed that is commonly used?
Kilometres per hour (km/h)
What is used to calculate speed?
Distance divided by time
What factor affects the speed of an object?
The force applied to it
Where is speed commonly experienced in everyday life?
All of the above
What is the motion of the earth around the sun an example of?
Circular motion
Why can you decide whose speed is the highest?
Because you know who took the shortest time to cover a certain distance
What is the term for the amount of distance covered in a given interval of time?
Speed
What is the speed of the car if it covers a total distance of 200 km in 4 hours?
50 km/h
Why do we usually calculate the average speed of a car?
Because the car moves with varying speed
What is the unit of speed in the statement 'the car has a speed of 50 kilometres per hour'?
kilometres per hour
Why do we need to measure intervals of time that are much shorter than a day?
Because we need to measure short intervals in everyday life
What is the formula to calculate speed?
Speed = Total distance covered / Total time taken
What is the term used for the time taken by the earth to complete one revolution of the sun?
Year
What is the term used for the time between one sunrise and the next?
Day
Why do clocks or watches measure time?
To measure time intervals
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
Quiz about motion and speed, comparing the speed of different objects and understanding the concept of motion.
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