EVERYDAY SCIENCE

Detailed explanation-1: -A book sitting on a shelf in the library is said to have potential energy because if it is nudged off the shelf, gravity will accelerate the book, giving the book kinetic energy.

Detailed explanation-2: -The greater the height, the more gravitational potential energy the object has. Gravitational potential energy is transferred to kinetic energy if the object falls towards the ground. An example of this is seen when a book is lifted and placed on a shelf.

Detailed explanation-3: -Answer and Explanation: The answer is 1. A reaction cannot be exothermic overall if activation energy is required. The statement is false because reactions can be exothermic overall even if activation energy.

Detailed explanation-4: -When the book is at rest, it has potential energy. But when you accidentally knock it off the table, this potential energy will turn into kinetic energy while the book falls since it’s in motion. However, as soon as the book hits the floor, this energy of motion will again convert to potential energy.