Welcome to your Ncert – class 9- science – Chapter 10 – Work and Energy 2
The gravitational potential energy of an object is due to
A ball is dropped from a height of 10 m.
A students caries a bag weighing 5 kg from the ground floor to his class on the first floor that is 2 m high. The work done by the boy is
Moon revolves around the earth due to gravitational force (F) of earth on moon. The work done by the gravitational force is (r = radius of circular orbit of moon)
A load of 50 kg is pulled upward by 5 m. The work done by the external force is (g = 10 m/s2)
A body is moved through a distance of 3 m in the following different ways. In which case is the maximum work done?
Two bodies of equal weight are kept at heights of h and 1.5h, respectively. The ratio of their PE is
In the SI system, the unit of potential energy is
The practical unit for the measurement of electric power is:
Which of the following will lead to a change in kinetic energy of a body?
What is potential energy?
What is kinetic energy?
Work is said to be done when:
The expression for work done, when the displacement is in the direction of the force is:
Energy can be defined as:
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