Physics Work and Energy Concepts

Work is done when a force makes something move.

The SI unit of work is the joule (J).

Work is calculated using the equation: Work Done = Force × Distance Moved.

<p>Energy represents the capacity to do work.</p> Signup and view all the answers

<p>Kinetic energy is associated with moving objects.</p> Signup and view all the answers

<p>Gravitational potential energy is involved when lifting an object against gravity.</p> Signup and view all the answers

<p>Chemical energy is stored in the bonds between atoms.</p> Signup and view all the answers

<p>Electrostatic energy is created by electric charges that attract each other but are held apart.</p> Signup and view all the answers

<p>The potential energy decreases while kinetic energy increases until all potential energy is converted to kinetic energy right before it strikes the ground.</p> Signup and view all the answers

<p>Energy can be transferred mechanically, electrically, by heating, and by radiation.</p> Signup and view all the answers

<p>Thermal energy is the energy stored due to the motion of particles, which is a component of a material's internal energy.</p> Signup and view all the answers

<p>The equation is $Work Done = Energy Transferred$.</p> Signup and view all the answers

<p>Potential energy in magnetic systems is the stored energy when magnets are positioned away from each other where attractions occur.</p> Signup and view all the answers

<p>'g' represents the acceleration due to gravity, commonly taken as $10 ext{ N/kg}$ on Earth's surface.</p> Signup and view all the answers

<p>The relationship is defined by the equation $Force = Mass imes Acceleration$.</p> Signup and view all the answers

<p>Work is measured in joules (J), and it is directly equivalent to energy in terms of units.</p> Signup and view all the answers

<p>Work done is calculated using the formula $Work Done = Force \times Distance Moved$.</p> Signup and view all the answers

<p>Efficiency is defined as the ratio of useful work done to total energy input, expressed as $Efficiency = {Useful Work Done \over Total Energy Input}$.</p> Signup and view all the answers

<p>An efficiency of 25% means that the engine does 25 joules of useful work for every 100 joules of energy supplied.</p> Signup and view all the answers

<p>The total energy output must equal the total energy input, reflecting the law of conservation of energy.</p> Signup and view all the answers

<p>Power is calculated using the formula $Power = {Work Done \over Time Taken}$, and its SI unit is the watt (W).</p> Signup and view all the answers

<p>Horsepower (hp) is a unit of power historically linked to steam engines and is equivalent to about 746 watts.</p> Signup and view all the answers

<p>In a power plant, energy transfers from fuel to electricity through stages like burning fuel to generate thermal energy, which drives turbines producing electricity.</p> Signup and view all the answers

<p>When a rubber band is released, its elastic energy converts to kinetic energy, which becomes thermal energy upon impact with the ground.</p> Signup and view all the answers