WorkEnergyPower SAQ

The formula for work is W = Fs, where W is the work done, F is the force applied, and s is the displacement.

The unit of work is the Joule (J), and it is defined as a force of 1N applied over a distance of 1m.

Work is a scalar quantity.

<p>The unit of work would still be the Joule (J), but the value would be 4J.</p> Signup and view all the answers

<p>The principle of conservation of energy states that energy can neither be created nor destroyed; it merely changes from one form to another. This implies that the total energy of an isolated system remains constant, but can be converted from one form to another.</p> Signup and view all the answers

<p>Kinetic energy is the energy of motion, whereas potential energy is the energy of position or stored energy. Examples of kinetic energy include the energy of a moving car or a rolling ball, while examples of potential energy include the energy of a stretched rubber band or a compressed spring.</p> Signup and view all the answers

<p>There are several types of potential energy, including gravitational potential energy, chemical potential energy, nuclear potential energy, and elastic potential energy. These types of energy arise due to an object's position in a force field, its internal configuration, or its condition.</p> Signup and view all the answers

<p>The key characteristic of energy is that it can be converted from one form to another, but it cannot be created or destroyed. This property makes energy a fundamental concept in physics, as it allows for the analysis of diverse physical phenomena.</p> Signup and view all the answers

<p>Energy is the ability to do work, and the amount of energy something has is the amount of work it can do. In other words, energy is the capacity to perform work, and work is the transfer of energy from one object to another.</p> Signup and view all the answers

<p>The formula for kinetic energy is Ek = 1/2mv^2, where m is the mass of the object and v is its velocity.</p> Signup and view all the answers

<p>The formula for gravitational potential energy is EP = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object.</p> Signup and view all the answers

<p>Some other forms of energy include sound energy, chemical energy, electromagnetic energy, internal energy (heat energy), nuclear energy, and electrical energy.</p> Signup and view all the answers

<p>The kinetic energy of an object is directly proportional to its mass, as shown by the formula Ek = 1/2mv^2.</p> Signup and view all the answers

<p>The primary difference is that kinetic energy is the energy of motion, while gravitational potential energy is the energy an object has due to its position in a gravitational field.</p> Signup and view all the answers

<p>The loss in potential energy is equal to the gain in kinetic energy.</p> Signup and view all the answers

<p>A renewable source of energy does not get used up.</p> Signup and view all the answers

<p>Some of the energy is converted to heat and sound energy.</p> Signup and view all the answers

<p>Momentum is always conserved.</p> Signup and view all the answers

<p>Power is the rate at which energy is converted from one form to another.</p> Signup and view all the answers

<p>The unit of power is the watt (W), and it represents 1 joule of work done per second.</p> Signup and view all the answers

<p>The formula for power is P = W / t, where P is power, W is work, and t is time.</p> Signup and view all the answers

<p>The purpose of calculating the percentage efficiency of a machine is to measure how good it is at converting energies without waste.</p> Signup and view all the answers

<p>Power is the rate at which work is done.</p> Signup and view all the answers