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प्रश्न
Correct your friend who says that acceleration gives the idea of how fast the position changes.
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उत्तर
There are two possible answers:
Velocity gives an idea of how fast the position changes, or Acceleration gives an idea of how fast the velocity changes.
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संबंधित प्रश्न
Give a scientific reason.
When an object falls freely to the ground, its acceleration is uniform.
What is meant by the term retardation? Name its S.I. unit.
Give one example of the following motion:
Uniform retardation
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.
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 train moving with a velocity of 20 ms−1 is brought to rest by applying brakes in 5 s. Calculate the 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?
When is the acceleration due to gravity negative?
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity, but uniform retardation.
Write the SI unit of acceleration and retardation.
State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.
Convert the following acceleration:
7200 km/h2 into m/s2
A car is moving with a speed of 50 km/h. One second later, its speed is 55 km/h. What is its acceleration?
The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: Acceleration.
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:
Distance travelled
From the given v-t graph it can be inferred that an object is
Negative acceleration is called ______.
What do you understand about negative acceleration?
m/s2 is the unit of ______.
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.
