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What does a positive acceleration mean? - Physics

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प्रश्न

What does a positive acceleration mean?

एका वाक्यात उत्तर
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उत्तर

Positive acceleration corresponds to situation when velocity is continuously increasing with respect to the time.

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पाठ 2: Motion in One Dimension - Exercise 2 [पृष्ठ ८०]

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फ्रँक Physics [English] Class 9 ICSE
पाठ 2 Motion in One Dimension
Exercise 2 | Q 25 | पृष्ठ ८०

संबंधित प्रश्‍न

Figure shows the velocity-time graphs for two cars A and B moving in the same direction. Which car has greater acceleration? Give reasons to your answer.


Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.

Which part of graph shows motion with uniform
(a) velocity (b) acceleration (c) retardation ?


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 car travels with uniform velocity of 25 m s-1 for 5 s. The brakes are then applied and the car is uniformly retarded and comes to rest in further 10 s. Find:

  1. The distance which the car travels before the brakes are applied,
  2. Retardation and
  3. The distance travelled by car after applying the brakes.

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When is the acceleration due to gravity positive?


The initial velocity of a car is 10 ms-1. It moves with an acceleration of 2 ms-2. What will be its speed after 10 seconds?


Figure represents graphically the velocity of a car moving along a straight road over a period of 100 hours.

Calculate the acceleration along AB and the retardation along BC.


The rate of change of velocity is ______.


When an object undergoes acceleration ______.


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