Advertisements
Advertisements
Question
From the given v-t graph it can be inferred that an object is
Options
in uniform motion
at rest
in non - uniform motion
moving with uniform accelerations
Solution
moving with uniform accelerations
APPEARS IN
RELATED QUESTIONS
Give one example of the following motion:
Uniform retardation
Define the term acceleration due to gravity. State its average value.
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.
Draw a graph for acceleration against time for a uniformly accelerated motion. How can it be used to find the change in speed in a certain interval of time?
A train starts from rest and accelerates uniformly at a rate of 2 m s-2 for 10 s. It then maintains a constant speed for 200 s. The brakes are then applied and the train is uniformly retarded and comes to rest in 50 s. Find
(i) The maximum velocity reached,
(ii) The retardation in the last 50 s,
(iii) The total distance travelled,
(iv) The average velocity of the train.
Explain the following concept in your own words with everyday examples:
Acceleration
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?
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 body falls towards the earth. Does it have positive or negative acceleration?
Out of energy and acceleration, which one is a vector?
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
Is it possible for an accelerating body to have constant speed?
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.
Negative acceleration is called ______.
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
The speed of a particle is constant. Will it have acceleration? Justify with an example.
The acceleration of the body that moves with a uniform velocity will be ______.
