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प्रश्न
Correct your friend who says that acceleration gives the idea of how fast the position changes.
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उत्तर
There are two possible answers:
Velocity gives an idea of how fast the position changes, or Acceleration gives an idea of how fast the velocity changes.
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संबंधित प्रश्न
Define acceleration. State its unit.
Define the term acceleration due to gravity. State its average value.
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.
(a) Is the magnitude of acceleration higher or lower than that of retardation ? Give a reason .
(b) Compare the magnitude of acceleration and 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 ball is rolling from A to D on a flat and smooth surface. Its speed is 2 cm/s. On reaching B, it was pushed continuously up to C. On reaching D from C, its speed had become 4 cm/s. It took 2 seconds for it to go from B to C. What is the acceleration of the ball as it goes from B to C?
State its value in C.G.S. as well as in S.I. system.
From the diagram given below, calculate deceleration.
Diagram is given below shows velocity – time graph of car P and Q, starting from the same place and in the same direction. Calculate the Acceleration of car Q between 2 s – 5 s.
A racing car, initially at rest, picks up a velocity of 180 kmh−1 in 4.5 s. Calculate
- acceleration
- distance covered by the car.
A motor bike running at 5 ms−1, picks up a velocity of 30 ms−1 in 5s. Calculate
- acceleration
- distance covered during acceleration.
What is the SI unit of acceleration?
What does a positive acceleration mean?
Write the SI unit of retardation.
A car traveling at 60 km/h, stops on applying brakes in 10 seconds. What is its acceleration?
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
Interpret the following graph:
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
If the velocity of a body does not change, then its acceleration is ______.
The speed of a particle is constant. Will it have acceleration? Justify with an example.
