Work, Power, and Energy

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What is Work in physics?

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Work is defined as the transfer of energy that occurs when a force is applied to an object over a distance. It is calculated as Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the formula for calculating Kinetic Energy?

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Kinetic Energy (KE) is calculated using the formula KE = 1/2 mv², where m is the mass of the object and v is its velocity.

Front

What is Potential Energy?

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Potential Energy (PE) is the energy stored in an object due to its position or configuration. The most common form is gravitational potential energy, calculated as PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

How does doubling the mass of an object affect its Kinetic Energy?

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If the mass of an object doubles, its kinetic energy also doubles, since KE is directly proportional to mass (KE = 1/2 mv²).

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What is the relationship between Kinetic Energy and Momentum?

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Kinetic Energy and Momentum are related; if an object has kinetic energy, it also has momentum. Momentum (p) is calculated as p = mv, where m is mass and v is velocity.

Front

What is the principle of Conservation of Energy?

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The principle of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another. The total energy in a closed system remains constant.

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What happens to Kinetic Energy when an object comes to a stop?

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When an object comes to a stop, its kinetic energy is converted into other forms of energy, such as thermal energy due to friction.

Front

What is the unit of Work in the International System of Units (SI)?

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The unit of Work in the SI system is the Joule (J), which is equivalent to one Newton meter (1 J = 1 N·m).

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How does friction affect the total mechanical energy of a system?

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Friction converts some of the mechanical energy (kinetic + potential) into thermal energy, resulting in a loss of total mechanical energy in the system.

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What is the work-energy theorem?

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The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. Mathematically, W = ΔKE.