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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ७

The rate of change of velocity is ______. - Science

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प्रश्न

The rate of change of velocity is ______.

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उत्तर

The rate of change of velocity is acceleration.

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अध्याय 2: Force and Motion - Evaluation [पृष्ठ २५]

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सामाचीर कलवी Science - Term 1 [English] Class 7 TN Board
अध्याय 2 Force and Motion
Evaluation | Q II. 2. | पृष्ठ २५

संबंधित प्रश्न

Define the term acceleration due to gravity. State its average value.


A body is moving vertically upwards. Its velocity changes at a constant rate from 50 m s−1 to 20 m s1 in 3 s. What is its acceleration?


A body falls freely from a certain height. Show graphically the relation between the distance fallen and square of time. How will you determine g from this graph?


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.


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 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.

What does a negative acceleration mean?

Distinguish between uniformly and non-uniformly accelerated motions.


State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.


What happens to the stepwise increasing speed-time graph when the size of each step is made very small?


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


A car is moving with a speed of 50 km/h. One second later, its speed is 55 km/h. What is its acceleration?


State whether true or false. If false, correct the statement.

Acceleration can get negative value also.


The slope of a velocity-time graph gives ______.


The Unit of acceleration is ______.


m/s2 is the unit of ______.


When an object undergoes acceleration ______.


Acceleration is defined as the rate of change of ______.


Assertion: A negative acceleration of a body can be associated with speeding up of the body.
Reason: Increase in the speed of a moving body is independent of its direction of motion.


When a body is said to be in

  1. uniform acceleration
  2. non–uniform acceleration?

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