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प्रश्न
State the type of motion represented by the following sketches in Figures.
Give an example of each type of motion.
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उत्तर
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Type of Motion:Uniform Acceleration
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The graph shows a straight line with a positive slope, indicating that velocity increases at a constant rate over time.
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This means the object is accelerating uniformly.
Example:
A car increasing its speed steadily on a straight road (e.g., from 0 km/h to 60 km/h in 10 seconds at a constant rate). -
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Type of Motion: Non-Uniform Retardation (Deceleration)
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The graph shows a curved line with a decreasing slope, indicating that velocity is decreasing over time, but not at a constant rate.
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This means the object is slowing down, and the rate of slowing down is changing.
Example:
A bicycle coming to a stop when brakes are applied gently and gradually. -
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संबंधित प्रश्न
Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.
(a) Is the magnitude of acceleration higher or lower than that of retardation ? Give a reason .
(b) Compare the magnitude of acceleration and retardation .
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.
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity and variable acceleration.
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 5 ms−1, picks up a velocity of 30 ms−1 in 5s. Calculate
- acceleration
- distance covered during acceleration.
A cyclist driving at 36 kmh−1 stops his motion in 2 s, by the application of brakes. Calculate
- retardation
- distance covered during the application of brakes.
State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.
Sketch the shape of the velocity-time graph for a body moving with:
Uniform acceleration.
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.
