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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ७

From the given v-t graph it can be inferred that an object is

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प्रश्न

From the given v-t graph it can be inferred that an object is

विकल्प

  • in uniform motion

  • at rest

  • in non - uniform motion

  • moving with uniform accelerations

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उत्तर

moving with uniform accelerations

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
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 I. 4. | पृष्ठ २५

संबंधित प्रश्न

The unit of retardation is ____________


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


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

Give an example of each type of motion.


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.

From the diagram given below, calculate deceleration.


From the velocity – time graph given below, calculate deceleration in region BC.


A cyclist driving at 36 kmh−1 stops his motion in 2 s, by the application of brakes. Calculate

  1. retardation
  2. distance covered during the application of brakes.

Define acceleration.


A body falls towards the earth. Does it have positive or negative acceleration?


Write the SI unit of retardation.


A car traveling at 60 km/h, stops on applying brakes in 10 seconds. What is its acceleration?


Out of energy and acceleration, which one is a vector?


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


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.


A car starts from rest and it is travelling with a velocity of 20 m/s in 10 s. What is its acceleration?


What is meant by negative acceleration?


If a body starts from rest, what can be said about the acceleration of the body?


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.


What is the difference between uniform acceleration and non–uniform acceleration?


When a body is said to be in

  1. uniform acceleration
  2. non–uniform acceleration?

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