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 (B)

What can energy be derived from in our body?

carbohydrates and fats

What is the formula for calculating work?

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

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

<p>True (A)</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 (A)</p> Signup and view all the answers

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

<p>True (A)</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 (A)</p> Signup and view all the answers

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

<p>False (B)</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 (A)</p> Signup and view all the answers

The greenhouse effect only has negative impacts on the environment.

<p>False (B)</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 (A)</p> Signup and view all the answers

Solar energy is derived from fossil fuels.

<p>False (B)</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 (B)</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 (B)</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 (D)</p> Signup and view all the answers

Energy is defined as the ability to do work.

<p>True (A)</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 (A)</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 (B)</p> Signup and view all the answers

Which of the following is considered a renewable energy source?

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

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

<p>False (B)</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. (D)</p> Signup and view all the answers

Electric energy is a form of renewable energy.

<p>False (B)</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 (C)</p> Signup and view all the answers

Flashcards

Energy

The ability to cause change or motion. It's what allows objects to move or change their state.

Work

When a force moves an object over a distance. The amount of work done depends on the force and the distance.

Work as a transfer of energy

The transfer of energy. It happens whenever work is done.

Distance and Work

The amount of work done depends on how far the object moves. The further the distance, the more work is done.

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Energy & Work Types

Different types of work require different amounts of energy. For example, athletes need more energy than office workers.

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Mechanical Energy

The energy of motion. Examples include a swinging cricket bat, flowing water, and wind.

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Heat Energy

Energy produced by burning fuels like wood, gas, coal, or petrol. It's used for cooking, powering engines, and evaporating water.

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Light Energy

Energy that travels in waves and allows us to see. It comes from sources like the sun, bulbs, and candles.

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Sound Energy

Energy created by vibrating objects, like thunder. It helps us hear.

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Electrical Energy

Energy that powers modern devices, and is used to run a wide variety of electrical machines.

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What is energy?

The ability to do work. It can change forms but not be created or destroyed.

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What is work?

When a force causes an object to move a distance. The amount of work depends on how much force is applied and how far the object moves.

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What are energy requirements?

Different types of work require different amounts of energy. For example, running needs more energy than sitting.

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How is energy transferred?

Energy is transferred when work is done. For instance, the energy you have is used to do activities like running.

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How does our body get energy?

Food rich in carbohydrates and fats provide energy for our bodies. These are called energy-giving foods.

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How is Sound Created?

Sound is created when objects vibrate. This vibration can travel through different materials like air, water, or wood.

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How does sound travel?

Sound energy travels through different mediums like air, water, and even solid materials like wood and metal.

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What are renewable energy sources?

Renewable energy sources are replenished naturally over a short period of time. Examples include sunlight, wind, flowing water, and biogas.

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What are non-renewable energy sources?

Non-renewable energy sources are not naturally renewed quickly. These sources are often limited and can eventually run out.

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How do we hear sound?

Sound can be heard when it reaches our ears and causes our eardrums to vibrate.

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How does wind power work?

Windmills use the force of moving air to spin blades, which generate electricity.

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What is the environmental impact of wind power?

Wind energy is a clean and sustainable source of energy.

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How does hydropower work?

Dams harness the kinetic energy of flowing water to spin turbines, generating electricity.

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What are the effects of hydropower on the environment?

Hydropower is reliable but can have negative environmental effects like impacting ecosystems.

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How does solar energy work?

Solar cells convert sunlight directly into electricity.

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What is the impact of solar energy?

Solar energy is clean, sustainable, and can be used in homes for daily needs.

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What are the disadvantages of fossil fuels?

Fossil fuels are limited resources formed from ancient organisms, and burning them pollutes the environment.

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Which energy sources are more desirable for the future?

Sustainable energy sources like wind and solar are preferable to non-renewable resources like fossil fuels.

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What is hydroelectricity?

A type of energy generated by the movement of water, often using dams to harness the power of flowing water.

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How are fossil fuels formed?

Fossil fuels are formed over millions of years from the remains of ancient organisms. They contain stored energy that can be released by burning.

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How are fossil fuels used to generate electricity?

Fossil fuels, like coal, oil, and natural gas, are commonly used to generate electricity in power plants. Burning these fuels releases heat energy, which is used to produce steam that drives turbines to generate electricity.

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Fossil fuels

Fossil fuels like coal, oil, and natural gas are formed from the remains of ancient plants and animals over millions of years.

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What is the greenhouse effect?

The greenhouse effect is the process where gases in the Earth's atmosphere trap the sun's heat, warming our planet, but too much can cause problems.

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Renewable energy

Renewable energy sources, like solar, wind, and hydro-power, can be replenished naturally, unlike finite fossil fuels.

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Fossil fuel pollution

Burning fossil fuels releases carbon dioxide and other harmful gases, contributing to the greenhouse effect and pollution.

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What is heat energy?

Energy produced by burning fuels like wood, gas, coal, or petrol. It's used for heating, cooking, and powering engines.

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What is light energy?

Energy that travels in waves and lets us see. It comes from the sun, light bulbs, and candles.

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What is sound energy?

Energy created by vibrating objects, like thunder. It lets us hear.

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Non-Renewable Energy

A resource that cannot be naturally replenished on a human timescale, like coal, oil, or natural gas.

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How are wind turbines used to generate electricity?

The process of transforming wind energy into electricity using wind turbines.

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Geothermal Energy

Energy produced by the Earth's internal heat, often used to generate electricity.

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Greenhouse Effect

The trapping of heat in the Earth's atmosphere by greenhouse gases, leading to global warming.

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How is hydroelectricity produced?

The process of harnessing the energy of flowing water through dams and turbines to generate electricity.

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