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प्रश्न
________ is said to be done when a force is acting on it.
विकल्प
Ramp
Simple machines
Work
Energy
Pulley
उत्तर
Work is said to be done when a force is acting on it.
APPEARS IN
संबंधित प्रश्न
Define 1 J of work.
Write the expression for work done by a force.
Define the term energy.
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
What is the condition for a force to do work on a body?
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
Name the force acting away from the centre of circular path.
Give two examples of work done.
Write an expression for the work done against gravity.
Can every force produce work?
Complete the following sentences:
1 H.P. = ........ W.
(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.
Fill in the boxe to show the corresponding energy transformation.
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
