Advertisements
Advertisements
Question
Which of the following does not posses the ability to do work not because of motion?
Options
a sparrow flying in the sky
a sparrow moving slowly on the ground
a sparrow in the nest on a tree
a squirrel going up a tree
Advertisements
Solution
We will justify all statements one by one as,
(a) A sparrow flying in the sky possesses kinetic energy, which can be transformed into work.
(b) A sparrow moving slowly on the ground possesses kinetic energy, which can be transformed into work.
(c) A sparrow in the nest does not possess any kinetic energy as it is at rest. It does not possess the ability to do work in terms of motion of the body.
(d) A squirrel going up a tree possesses kinetic energy, which can be transformed into work.
Therefore, the answer is:
(c) A sparrow in the nest of a tree.
APPEARS IN
RELATED QUESTIONS
The energy of a flying kite is kinetic energy.
When a boy doubles his speed, his kinetic energy becomes
State two factors on which the kinetic energy of a moving body depends.
A bullet of mass 50 g is moving with a velocity of 500 m s−1. It penetrated 10 cm into a still target and comes to rest. Calculate:
- the kinetic energy possessed by the bullet, and
- the average retarding force offered by the target.
If the speed of a body is halved, what will be the change in its kinetic energy?
A horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, What is the ration of their kinetic energies?
When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus? Explain.
A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2 cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
Find out the form of energy possessed by the following thing.
A rolling ball
What is energy of motion? Give examples.
