Energy and Work done

What is false about energy?

• when energy is transferred, work is done

• energy is the ability to do work

• gravitational force is an energy

• energy cannot be created or destroyed but transferred from one form to another

What is false when a man is lifting up a book?

• a force is applied on the book

• the book is moving

• the book moves in the direction of the force applied on it

• work is not done by the man as energy is not transferred from the man to the book

What is the SI unit of energy and work done?

• Newton (N)

• Pascal (Pa)

• Joule (J)

• Kilogram (Kg)

What is the formula to calculate amount of work done?

• Work done = Force ÷ Area

• Work done = Force x Distance

• Work done = Mass x Gravitational Field Strength

• Work done = Force ÷ Distance

What is not a condition for work to be done on an object?

• A force is applied on the object

• The object moves

• The object moves in the direction of the force applied on it

• The force applied on the object is smaller than weight of the object

Work is not done by the man because the wall is not ................

Work is not done by the man because he is not applying any ............. on any object.

The man is not doing work on the book as ............

• the book was not lifted

• the book is not moving in the same direction as the force applied on it

• the man is not walking

• the book is being held against the gravitational force acting on it

The total energy of the car remains ................ because energy is conserved.

Energy is transferred from one object to another, or converted from one form to another.

• True

• False