Exercises to the text "Work and Energy"

1. Answer the questions to the text:

  1. Are work and energy closely related?
  2. What is work?
  3. What is energy?
  4. Are there many manifestations of energy?
  5. What manifestations of energy are mentioned in the text?
  6. What is mechanical energy?
  7. What is potential energy?
  8. What is kinetic energy?
  9. What energy does a stone have when it is held over the edge of a cliff?

10.What is its potential energy equal to?

11.When will the stone’s kinetic energy be at a maximum?

12.When will the stone’s potential energy be at a minimum?

13.What point can the value of its kinetic energy exceed the value of the potential energy it possessed before it fell at?

14.Will the mechanical energy be the same?

 

2. Give the definition of the following;

  1. 1.    mechanical energy
  2. a.    is energy of motion.
  3. 2.    kinetic energy
  4. b.    is stored energy of position.
  5. 3.    potential energy
  6. c.     is possessed by an object due to its motion or due to its position.

 

  1. 3.    Insert a necessary word or word combination:

Exertion, ability, manifestations, mechanical energy, potential energy, at a maximum, at a minimum, exceed

  1. Work is the exertion of force over a given distance to displace or move an object, kinetic energy … .
  2. Energy is the … to accomplish work.
  3. There are many …of energy.
  4. … is the sum of potential energy and kinetic energy.
  5. Its … is equal to its weight (mass times the acceleration due to gravity) multiplied by its height above the bottom of the canyon below.
  6. … is the same as one-half its mass multiplied by the square of its velocity.
  7. The stone's kinetic energy will be at a …, and its potential energy will be …, just before it hits bottom,
  8. At no point can the value of its kinetic energy … the value of the potential energy it possessed before it fell.