Available Answers

1. 1.

   Fill in the blanks.

   1. Work is said to be done when a __________ moves a body in its own direction.
   2. If a force causes zero displacement, then work done is ________.
   3. When work is done by a body , it's loses __________.
   4. 1 kgf m = __________ J.
   5. When we pedal a bicycle, the ___________ energy gets converted into the __________ energy of the bicycle.
2. 2.

   State whether the following statements and true (T) and false (F). Correct the false statement.

   1. 1 J = 1 N m.
   2. Work and energy are two independent terms.
   3. Kinetic energy of a body is the energy possessed due to its position.
   4. A potential of a body depends on it's mass , velocity and height above the ground.
   5. A wound spring of a watch or a toy car has gravitational potential energy strored in it.
   6. Roller coaster ride is an example of energy transformation.
3. 3.

   Match the columns.

   Column A	Column B
   1. Zero work done	a. Water stored in dam
   2. Kinetic energy	b. A freely falling body
   3. Elastic potential energy	c. A man pushing a wall
   4. Gravitational potential energy	d. Moving wind
   5. Energy transformation	e. Stretched rubber band

    

4. 4.

   Show in the form of a flowchart, the types of mechanical energy, units and examples.

5. 5.

   Show in the form of a flowchart, the energy transformation taking place in a power plant.

6. 6.

   A boy with his heavy bag waiting at the bus stop does no work. Give reasons.