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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ७

Correct your friend who says that acceleration gives the idea of how fast the position changes.

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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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पाठ 2: Force and Motion - Evaluation [पृष्ठ २६]

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सामाचीर कलवी Science - Term 1 [English] Class 7 TN Board
पाठ 2 Force and Motion
Evaluation | Q V. 3. | पृष्ठ २६

संबंधित प्रश्‍न

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.


When is the acceleration due to gravity negative?


A racing car is moving with a velocity of 50 m/s. On
applying brakes, it is uniformly retarded and comes to rest in 20 seconds. Calculate its acceleration.


From the diagram given below, calculate acceleration.


A cyclist driving at 5 ms−1, picks a velocity of 10 ms−1, over a distance of 50 m. Calculate

  1. acceleration
  2. time in which the cyclist picks up above velocity.

A truck running at 90 kmh−1, is brought to rest over a distance of 25 m. Calculate the retardation and time for which brakes are applied.


A motor bike running at 90 kmh−1 is slowed down to 18 kmh−1 in 2.5 s. Calculate

  1. acceleration
  2. distance covered during slow down.

The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?


A car accelerates uniformly from a velocity of 18 km/h to 36 km/h in 15 min. What is its acceleration?


The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: Acceleration.


A car accelerates to a velocity of 30 m/s in 10 s and then decelerates for 20 s so that it stops. Draw a velocity-time graph to represent the motion and find:
The Deceleration.


Negative acceleration is called ______.


Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction or both of them.

Reason: Acceleration can be produced only by change in magnitude of the velocity. It does not depend the direction.


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 ______.


When a body starts from rest, the acceleration of the body after 2 seconds in ______ of its displacement.


Acceleration is defined as the rate of change of ______.


A car is being driven at a speed of 20ms-1 when brakes are applied to bring it to rest in 5 s. The deceleration produced in this case will be ______.


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