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प्रश्न
Explain the following concept in your own words with everyday examples:
Acceleration
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उत्तर
The rate of change of velocity is known as acceleration. It is a vector quantity.
For example, if a car is moving on a straight with variable speed, it will possess some acceleration. In case the speed of the car remains the same but the direction of the car changes, then also the car would be accelerating.
संबंधित प्रश्न
Give a scientific reason.
When an object falls freely to the ground, its acceleration is uniform.
The velocity-time graph for a uniformly retarded body is a straight line inclined to the time axis with an obtuse angle. How is retardation calculated from the velocity-time graph?
A bullet initially moving with a velocity 20 m/s strikes a target and comes to rest after penetrating a distance 10 cm into the target. Calculate the retardation caused by the target.
A space craft flying in a straight course with velocity of 75 km s-1 fires its rocket motors for 6.0 s. At the end of this time its speed is 120 km s-1 in the same direction.
Find
(i) The space craft's average acceleration while the motors were firing
(ii) The distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors being in action for only 6 s.
A motor bike running at 90 kmh−1 is slowed down to 18 kmh−1 in 2.5 s. Calculate
- acceleration
- distance covered during slow down.
Is it possible for an accelerating body to have constant speed?
Negative acceleration is called ______.
What do you understand about negative acceleration?
When an object undergoes acceleration ______.
