Advertisements
Advertisements
Question
The total energy of an object falling freely towards the ground ______.
Options
decreases
remains unchanged
increases
increases in the beginning and then decreases
Advertisements
Solution
The total energy of an object falling freely towards the ground remains unchanged.
Explanation:
In an object falling freely to the ground, as the object's distance from the ground decreases, so does the potential energy stored in the object; But the kinetic energy of a freely falling object increases as the velocity increases over time. Thus, the potential energy lost by an object in free fall is equal to the kinetic energy it gains, i.e. the total energy of the object remains constant.
APPEARS IN
RELATED QUESTIONS
Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate
- the maximum height to which it rises.
- the total time it takes to return to the surface of the earth.
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.
Give reason for the following :
The force of gravitation between two cricket balls is extremely small but that between a cricket ball and the earth is extremely large.
What do you understand by the term 'acceleration due to gravity of earth' ?
What is the usual value of the acceleration due to gravity of earth ?
Explain why, the tip of a sewing needle is sharp.
The value of acceleration due to gravity of earth :
A force acts for 10 s on a stationary body of mass 100 kg, after which the force ceases to act. The body moves through a distance of 100 m in the next 5 s. Calculate : The acceleration produced by the force
A car is moving with a uniform velocity 30 ms-1. It is stopped in 2 s by applying a force of 1500 N through its brakes. Calculate the following values : The retardation produced in car.
In vacuum, all freely falling objects have the same force. Is it true?
State whether the below statement is True or False.
Neglecting air resistance, a body falling freely near the earth's surface has a constant acceleration.
Explain why:
Objects fall to the earth.
Free fall of an object does not depend on the mass of the object.
Write scientific reason.
When we drop a feather and a stone at the same time from a height the stone reach the earth faster than a feather.
Write scientific reason.
The value of gravitational acceleration (g) is taken to be -g when studying the motion of an object thrown upwards in a straight line.
Define acceleration due to gravity.
Distinguish between:
Universal gravitational constant - Gravitational acceleration of earth.
Write a short note.
Free Fall
