8th Sci [Spring Final].pdf - 8th grade science final exam...

  • No School
  • AA 1
  • ethanbakal
  • 6
  • 50% (2) 1 out of 2 people found this document helpful

This preview shows page 1 - 2 out of 6 pages.

energy Energy is the ability to do work or cause change. What is kinetic energy? When is kinetic energy the greatest? Kinetic energy is the energy of an object that is due to that object’s motion. Kinetic energy is at its greatest when an object is moving at top speed. What is potential energy? When is it at the greatest? Potential energy is the energy that an object has because of the position, shape, or condition of the object. There are two main types of potential energy: gravitational potential energy and elastic potential energy. Gravitational potential energy is based on the height and weight, or gravitational pull on an object. Elastic potential energy is based on how much energy an object stores from being stretched. Give three examples of each of the following forms of energy. Chemical ~ battery, food, fire Thermal ~ molecules of everything Nuclear ~ the sun, nuclear fission Electromagnetic ~ all waves of the EM spectrum Electrical ~ all electrical items Sound ~ anything that makes sound Mechanical ~ kinetic and potential energy energy conversions The change from one form of energy to another is called energy conversion. Describe energy conversion between 6 forms of energy. Conversions from potential to kinetic energy involve things like skating from a height to the ground and then back up again, or a stretched rubber band being released to fly in the air. People, as well as plants and animals, convert chemical energy of food into energy to be used for the body to live. Describe the Law of Conservation of Energy The Law of Conservation of Energy states that energy cannot be destroyed of made, it is simply converted to one form or another. energy conversions Temperature is the measure of average kinetic energy of each particle within an object. Describe the temperature of an object during a change in state. The temperature of an object does not change when it is changing states. In what direction does heat move? Heat moves from the warmer object to the cooler object until both have the same temperature. What are the differences between insulators and conductors? Conductors allow the transfer of energy or heat, while conductors try to slow down the transfer of energy or heat. Explain the difference between temperature, heat, and thermal energy. Temperature is the average kinetic energy, while thermal energy is the total kinetic energy.
Image of page 1
Image of page 2

You've reached the end of your free preview.

Want to read all 6 pages?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture