Energy and Work in Physics
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Questions and Answers

What primarily determines the amount of work done on an object?

  • The mass of the object only
  • The force applied and the distance moved (correct)
  • The speed of the object
  • The type of energy used

    • Energy is required to keep an object at rest.

    False

    What can energy be derived from in our body?

    carbohydrates and fats

    What is the formula for calculating work?

    <p>Work = Force × Distance</p> Signup and view all the answers

    Work is a transfer of ______.

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

    Energy can be created and destroyed.

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

    Match the type of work with the required energy level:

    <p>Athletic activities = More Energy Office work = Less Energy Heavy lifting = More Energy Light tasks = Less Energy</p> Signup and view all the answers

    What are two examples of physical activities that require energy?

    <p>Pushing a cart and running a race.</p> Signup and view all the answers

    The body gets energy by consuming foods rich in _______ and fats.

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

    Match the following forms of work with their energy requirements:

    <p>Running = High energy requirement Sitting at a desk = Low energy requirement Lifting a heavy box = Moderate energy requirement Walking = Low to moderate energy requirement</p> Signup and view all the answers

    Which of the following is an example of mechanical energy?

    <p>A cricket bat swinging to hit a ball</p> Signup and view all the answers

    Heat energy can be produced by burning fuels such as wood and coal.

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

    What is the primary use of light energy in plants?

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

    The _____ energy is produced when objects vibrate.

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

    Match the types of energy with their primary sources:

    <p>Mechanical Energy = Flowing water and wind Heat Energy = Burning wood and coal Light Energy = Sunlight Sound Energy = Vibrating objects</p> Signup and view all the answers

    What causes sound energy to be produced?

    <p>When an object vibrates</p> Signup and view all the answers

    Sound energy can travel through air, water, wood, and metal.

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

    What happens to our eardrums when sound energy reaches them?

    <p>They shake.</p> Signup and view all the answers

    ___ energy sources are continuously replenished by nature.

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

    Match the following energy sources with their categories:

    <p>Sunlight = Renewable Energy Source Wind = Renewable Energy Source Coal = Non-renewable Energy Source Biogas = Renewable Energy Source</p> Signup and view all the answers

    What is hydro-electricity primarily produced from?

    <p>Flowing water</p> Signup and view all the answers

    Non-renewable sources of energy can be replenished after use.

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

    What is the cleanest fossil fuel mentioned, and what is it commonly used for?

    <p>Natural gas (CNG), used in vehicles and for cooking.</p> Signup and view all the answers

    A _____ produces enough electricity to serve multiple cities.

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

    Match the following fossil fuels with their primary uses:

    <p>Coal = Electricity generation in thermal power plants Petrol = Fuel for vehicles LPG = Cooking fuel Natural gas = Cleanest fossil fuel used in vehicles</p> Signup and view all the answers

    What is the primary source of energy for fossil fuels?

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

    The greenhouse effect only has negative impacts on the environment.

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

    What type of energy is obtained from falling or fast-running water?

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

    The process in which gases in the Earth's atmosphere trap some of the sun's heat is called the __________.

    <p>greenhouse effect</p> Signup and view all the answers

    Match the following renewable energy sources with their characteristics:

    <p>Solar energy = Energy from the sun Wind energy = Energy from air movement Hydro energy = Energy from water movement Thermal energy = Energy from heat conversion</p> Signup and view all the answers

    What is the primary mechanism used in wind power to generate electricity?

    <p>Windmills rotating blades</p> Signup and view all the answers

    Solar energy is derived from fossil fuels.

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

    What are the three main fossil fuels mentioned in the content?

    <p>Petroleum, natural gas, and coal</p> Signup and view all the answers

    Wind energy is considered a ______ source of energy.

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

    What are the potential negative impacts of hydropower?

    <p>Affects aquatic ecosystems</p> Signup and view all the answers

    Match each energy source with its primary mechanism.

    <p>Wind Power = Windmills use moving air Hydropower = Water flows through turbines Solar Energy = Solar cells absorb sunlight Fossil Fuels = Burning ancient organic remains</p> Signup and view all the answers

    Fossil fuels are renewable resources.

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

    Solar panels can be installed on ______ to generate electricity for daily use.

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

    Which of the following can be classified as work?

    <p>Pushing a wall</p> Signup and view all the answers

    Energy is defined as the ability to do work.

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

    What do we call sources of energy that can be renewed after being used?

    <p>Renewable energy sources</p> Signup and view all the answers

    The burning of fossil fuels produces gases like __________.

    <p>carbon dioxide</p> Signup and view all the answers

    Which of the following sources of energy does not cause pollution?

    <p>Flowing water</p> Signup and view all the answers

    Match the following types of energy with their characteristics:

    <p>Fossil Fuels = Limited and non-renewable Wind = Renewable and clean Hydroelectricity = Generated from flowing water Sunlight = Renewable source of energy</p> Signup and view all the answers

    Petroleum, gas, and coal are called __________ fuels.

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

    Which form of energy is produced by the movement of the wind?

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

    Which of the following is considered a renewable energy source?

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

    Mechanical energy can only come from objects that are in motion.

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

    What is the greenhouse effect?

    <p>The greenhouse effect is the trapping of the sun's warmth in the planet's lower atmosphere due to the presence of greenhouse gases.</p> Signup and view all the answers

    Coal is formed from the remains of ______ over millions of years.

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

    Match the following forms of energy with their descriptions:

    <p>Hydro energy = Energy obtained from flowing water Geothermal energy = Energy derived from the Earth's heat Solar energy = Energy from sunlight Wind energy = Energy generated from air movement</p> Signup and view all the answers

    What is a disadvantage of using fossil fuels?

    <p>They produce pollution when burned.</p> Signup and view all the answers

    Electric energy is a form of renewable energy.

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

    How is hydro-electricity produced?

    <p>Hydro-electricity is produced by water flowing through dams that spins turbines, generating electricity.</p> Signup and view all the answers

    The energy of an object due to its position or motion is known as ______.

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

    Which of the following forms of energy is produced from the vibration of objects?

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

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