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प्रश्न
If a particle is accelerating, it is either speeding up or speeding down. Do you agree with this statement?
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उत्तर
Acceleration does not mean speeding up or speeding down. It means the change of velocity either in direction or in magnitude.
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संबंधित प्रश्न
Read the statement below carefully and state, with reason and example, if it is true or false:
A particle in one-dimensional motion with constant speed must have zero acceleration.
Read the statement below carefully and state, with reason and example, if it is true or false:
A particle in one-dimensional motion with positive value of acceleration must be speeding up.
The given figure gives a speed-time graph of a particle in motion along a constant direction. Three equal intervals of time are shown. In which interval is the average acceleration greatest in magnitude? In which interval is the average speed greatest? Choosing the positive direction as the constant direction of motion, give the signs of v and a in the three intervals. What are the accelerations at the points A, B, C and D?
Give example where the velocity of a particle is zero but its acceleration is not zero.
Give example where the velocity is opposite in direction to the acceleration.
In figure shows the x coordinate of a particle as a function of time. Find the sings of vx and ax at t = t1, t = t2 and t = t3.
A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is
The accelerations of a particle as seen from two frames S1 and S2 have equal magnitude 4 m/s2.
An object having a velocity 4.0 m/s is accelerated at the rate of 1.2 m/s2 for 5.0 s. Find the distance travelled during the period of acceleration.
If the velocity of a car is given by V = (150 − 10x)½ m/s. If a car retards their motion by applying brakes then what will be the acceleration?
A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct?
A graph of x versus t is shown in figure. Choose correct alternatives from below.
- The particle was released from rest at t = 0.
- At B, the acceleration a > 0.
- At C, the velocity and the acceleration vanish.
- Average velocity for the motion between A and D is positive.
- The speed at D exceeds that at E.
Give example of a motion where x > 0, v < 0, a > 0 at a particular instant.
The dimensional formula for acceleration is ______.
What does the area under a velocity-time curve represent?
Which of the equation is derived from the sum of the areas of rectangle and triangle under v-t graph for uniform acceleration?
A vehicle applies its brakes and slows down uniformly. This is an example of ______.
Acceleration is defined as ______.
A velocity–time graph is a straight line with zero slope. What does this indicate about the motion?
For a body starting from rest and moving with uniform positive acceleration, the distances covered in successive equal time intervals are in the ratio ______.
A ball is thrown straight up from the ground at 15 m/s. At the same time, another ball is dropped from rest from a height of 30 m. If g = 10 m/s2, at what height above the ground do they meet?
Instantaneous acceleration of a particle is correctly expressed as ______.
