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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ७

What do you mean by constant acceleration?

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प्रश्न

What do you mean by constant acceleration?

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उत्तर

A body is said to have constant acceleration, if it travels is a straight line and its velocity increases or decreases by equal magnitude in equal intervals of time.
Ex: the motion of a freely falling body.

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

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

संबंधित प्रश्न

Define acceleration. State its unit.


A toy car initially moving with uniform velocity of 18 km h-1 comes to a stop in 2 s. Find the retardation of the car in S.I. units.


State the type of motion represented by the following sketches in Figures.

Give an example of each type of motion.


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 train moving with a velocity of 20 ms−1 is brought to rest by applying brakes in 5 s. Calculate the retardation.


If a body is moving with a constant velocity its acceleration is ______.


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?


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.


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.

Interpret the following graph:


A body has an acceleration of -3.5 ms-2. What is its retardation?


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


The rate of change of velocity is ______.


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


The acceleration of the body that moves with a uniform velocity will be ______.


It is possible to have objects moving with uniform speed but variable acceleration.


Assertion: A positive acceleration of a body can be associated with the slowing down of the body.
Reason: Acceleration is a vector.


Assertion: Position-time graph of a stationary object is a straight line parallel to the time axis. 
Reason: For a stationary object, the position does not change with time.


When a body is said to be in

  1. uniform acceleration
  2. non–uniform acceleration?

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