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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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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

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.


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.

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?


State its value in C.G.S. as well as in S.I. system.


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.


What is the SI unit of acceleration?


What does a negative acceleration mean?

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


State if the following situation is possible:
A body moving with a constant velocity in an accelerated motion.


Interpret the following graph:


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


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


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.


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


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.


m/s2 is the unit of ______.


A bus accelerating with 4ms-2 changes its speed from 60ms_1 to a certain value in 5s. The final speed is ______.


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.


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