Advertisements
Advertisements
प्रश्न
Give a scientific reason.
When an object falls freely to the ground, its acceleration is uniform.
Advertisements
उत्तर
When an object falls freely to the ground, it is under the effect of a constant force known as the force of gravity. No other forces act on it. Hence, from Newton's second law of motion, we can say that this constant force of gravity accelerates the freely falling object uniformly. This uniform acceleration is known as acceleration due to gravity which acts towards the centre and is denoted by g.
APPEARS IN
संबंधित प्रश्न
An object of mass 16 kg is moving with an acceleration of 3 m/s2. Calculate the applied force. If the same force is applied to an object of mass 24 kg, how much will be the acceleration?
When is the acceleration due to gravity positive?
From the velocity – time graph given below, calculate deceleration in region BC.

What does a positive acceleration mean?
Write the SI unit of retardation.
The initial velocity of a car is 10 ms-1. It moves with an acceleration of 2 ms-2. What will be its speed after 10 seconds?
The speed of a car increases from 10 km/h to 64 km/h in 10 seconds. What will be its acceleration?
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?
The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: Deceleration
Correct your friend who says that acceleration gives the idea of how fast the position changes.
What do you mean by constant acceleration?
A bus can accelerate with an acceleration of 1 m/s2 . Find the minimum time for the bus to attain the speed of 100 km/s from 50 km /s.
The slope of a velocity-time graph gives ______.
When a body starts from rest, the acceleration of the body after 2 seconds in ______ of its displacement.
The acceleration of the body that moves with a uniform velocity will be ______.
What is meant by negative acceleration?
Acceleration is defined as the rate of change of ______.
An object can be moving with uniform speed but with variable acceleration.
What is the difference between uniform acceleration and non–uniform acceleration?
