Energy Concepts in Physics
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Questions and Answers

What is energy defined as?

  • The ability to remain still
  • The ability to cause change (correct)
  • The ability to gain momentum
  • The ability to lose mass

    • Work transfers energy between systems.

    True

    What unit is used to measure both energy and work?

    joules

    Energy can be described as the ability to do __________.

    <p>work</p> Signup and view all the answers

    What is an example of a system?

    <p>Both A and B</p> Signup and view all the answers

    Energy can be transferred without any work being done.

    <p>False</p> Signup and view all the answers

    What example is given to illustrate energy causing change?

    <p>Turning on an electric light</p> Signup and view all the answers

    Match the following types of energy with their examples:

    <p>Kinetic Energy = A moving tennis racket Potential Energy = A compressed spring Thermal Energy = Heat from the sun Sound Energy = Music from a speaker</p> Signup and view all the answers

    Which of the following is not a form of energy mentioned?

    <p>Solar energy</p> Signup and view all the answers

    Kinetic energy depends on both mass and speed of an object.

    <p>True</p> Signup and view all the answers

    What is kinetic energy?

    <p>Energy due to motion.</p> Signup and view all the answers

    Energy from the Sun that warms Earth is known as __________ energy.

    <p>radiant</p> Signup and view all the answers

    Match the following forms of energy with their descriptions:

    <p>Mechanical energy = Energy due to motion and position Chemical energy = Stored in bonds of chemical compounds Electrical energy = Energy from electric charges Radiant energy = Energy from electromagnetic waves</p> Signup and view all the answers

    How is chemical energy in gasoline best described?

    <p>Stored and transportable energy</p> Signup and view all the answers

    All forms of energy are fundamentally different from each other.

    <p>False</p> Signup and view all the answers

    What unit measures kinetic energy?

    <p>Joules</p> Signup and view all the answers

    What is the kinetic energy of a jogger with a mass of 60.0 kg moving at a speed of 3.0 m/s?

    <p>270 J</p> Signup and view all the answers

    Potential energy is energy that is in motion.

    <p>False</p> Signup and view all the answers

    How does the kinetic energy of an object change when its speed doubles?

    <p>The kinetic energy increases by a factor of four.</p> Signup and view all the answers

    The formula for calculating kinetic energy is KE = __.

    <p>1/2 mv^2</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Kinetic Energy = Energy of motion Potential Energy = Stored energy due to position or structure Elastic Potential Energy = Energy stored in stretched or compressed objects Gravitational Potential Energy = Energy stored due to gravity between objects</p> Signup and view all the answers

    By how many times does the kinetic energy of a car increase if its speed doubles from 50 km/h to 100 km/h?

    <p>4 times</p> Signup and view all the answers

    A book can have potential energy even when it is not moving.

    <p>True</p> Signup and view all the answers

    What type of energy is stored in a stretched rubber band?

    <p>Elastic potential energy</p> Signup and view all the answers

    What is the energy stored in a stretched rubber band or compressed spring called?

    <p>Elastic potential energy</p> Signup and view all the answers

    Chemical potential energy is only relevant to food and gasoline.

    <p>False</p> Signup and view all the answers

    What happens to chemical potential energy when a substance is burned?

    <p>It is converted to thermal energy and radiant energy.</p> Signup and view all the answers

    Gravitational potential energy depends on an object's mass, Earth's gravity, and the object's ______.

    <p>height</p> Signup and view all the answers

    Which equation represents the gravitational potential energy?

    <p>GPE = mass (kg) x gravity (N/kg) x height (m)</p> Signup and view all the answers

    Gravitational potential energy exists only in systems with two objects or more.

    <p>False</p> Signup and view all the answers

    How does the elastic potential energy of a trampoline change as a person jumps on it?

    <p>It increases as the trampoline stretches, storing more energy.</p> Signup and view all the answers

    Match the following types of potential energy with their descriptions:

    <p>Elastic potential energy = Energy stored in a stretched rubber band Chemical potential energy = Energy stored in chemical bonds Gravitational potential energy = Energy due to gravitational forces between objects Thermal energy = Energy associated with heat and temperature</p> Signup and view all the answers

    Which of the following is NOT a form of energy?

    <p>Photosynthetic energy</p> Signup and view all the answers

    A system can have both kinetic energy and potential energy at the same time.

    <p>True</p> Signup and view all the answers

    Define elastic potential energy.

    <p>Elastic potential energy is the potential energy stored in an object when it is stretched or compressed.</p> Signup and view all the answers

    The potential energy due to the height of an object above the ground is called __________.

    <p>gravitational potential energy</p> Signup and view all the answers

    Match the form of energy with its description:

    <p>Mechanical Energy = Energy due to motion or position Chemical Potential Energy = Stored energy in chemical bonds Kinetic Energy = Energy of a moving object Thermal Energy = Energy related to temperature and heat</p> Signup and view all the answers

    What happens to gravitational potential energy (GPE) when a vase is moved to a higher shelf?

    <p>GPE increases</p> Signup and view all the answers

    Gravitational potential energy is independent of the chosen reference level.

    <p>False</p> Signup and view all the answers

    How do you calculate the gravitational potential energy (GPE)?

    <p>GPE = mass × gravity × height</p> Signup and view all the answers

    The gravitational potential energy of the blue vase-Earth system is about _____ J relative to the floor.

    <p>90</p> Signup and view all the answers

    What is the value of gravitational potential energy of an 8.0-kg textbook placed on a 1.25-m high desk relative to the floor? (Use g = 9.8 N/kg)

    <p>98 J</p> Signup and view all the answers

    The GPE of the green vase-Earth system is always less than the GPE of the blue vase-Earth system.

    <p>True</p> Signup and view all the answers

    What reference level would you use to calculate the GPE of a ceiling fan placed 2.5 m above the floor?

    <p>The floor</p> Signup and view all the answers

    Match the following values with their corresponding gravitational potential energy (GPE):

    <p>Blue Vase (relative to floor) = 90 J Green Vase (relative to same reference) = Less than 90 J Ceiling Fan (relative to floor) = 98 J Textbook (relative to floor) = 98 J</p> Signup and view all the answers

    Study Notes

    Describing Energy

    • Energy is the ability to cause change
    • Energy limits what can happen in any system
    • Energy is transferred when work is done

    Types of Energy

    • Kinetic Energy: Energy due to motion; depends on mass and speed (KE = 1/2mv²)
      • Example: A moving car, a falling object
    • Potential Energy: Stored energy due to position or configuration
      • Gravitational Potential Energy: Stored energy due to an object's height relative to a reference point (GPE = mgh)
        • Example: An apple on a tree
      • Elastic Potential Energy: Stored energy in a stretched or compressed object
        • Example: A stretched rubber band
      • Chemical Potential Energy: Stored energy in chemical bonds
        • Example: Food, gasoline
    • Radiant Energy: Energy that travels as waves
      • Example: Sunlight, heat
    • Mechanical Energy: Sum of kinetic and potential energy in a mechanical system
      • Example: A pendulum
    • Electrical Energy: Energy related to the movement of electrically charged particles; potential
      • Example: In a circuit
    • Thermal Energy: Energy due to the motion of particles in a substance
      • Example: Heat from a stove

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    Describing Energy Lesson 2 PDF

    Description

    This quiz explores the fundamental concepts of energy including kinetic, potential, and radiant energy. Understand how energy is defined, transferred, and its different types through examples and formulas. Test your knowledge on how energy influences systems in physics.

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