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प्रश्न
उत्तर
Potential energy of a body depends upon:
(i) Mass of the body
(ii) Acceleration due to gravity
(iii) Height of the body
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
Name the forms of energy which a wound-up watch spring possesses.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
Why does a spanner have a long handle?
A body does 20 J of work in 10 s. What is its power?
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
What is work?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
