Chapter+8

> > > **Notes:** Write down at least 10 key points from the chapter. > >> 2nd : That motion must be in the same direction as the applied force. >> 3rd : Specify your system. In other words define what work is being done on. >> >> W = F x d = 10 N x 2 m = 20 Nm = 20 J >> Force and work are directly proportional, therefore (W = 40 J) >> – Rate is something per unit of time (velocity). Therefore power is: P = W/t. >>> Mechanical Power: P = W/t >>> Electrical Power: P = I V = V(squared)/R Fd(in)=Fd(out) or MA=F(out)/F(in)=d(in)/d(out) or F*d (input) =F*d (output) Type 1 lever is a pulley with the axis of the pulley acting as the fulcrum. Type 2 lever is a pulley with the fulcrum at one end of the pulley, where the pulley and the supporting rope makes contact.
 * ​Key Definitions:** List all the key terms with an abbreviated form of their definition.
 * 1) __** work **__ - __The product of the force on an object__ and the distance through which the object is moved (when force is constant and motion is in a straight line in the direction of the force); measured in joules.
 * 2) __** power **__ - __Rate at which work is done__ or energy is transformed, equal to the work done or energy transformed divided by time; measured in watts.
 * 3) __**potential energy**__- Energy of position, usually related to the relative position of two things, such as a stone and the earth, or an electron and a nucleus__.(PE = m x g x h)__ Measured in joules.
 * 4) __**kinetic energy**__- Energy of motion, __equal to half the mass multiplied by the speed squared__. Measured in joules.
 * 5) __**conservation of energy**__- A principle stating that the total energy of an isolated system __remains constant regardless of changes__ within the system
 * Energy cannot be created or destroyed. It can be transformed from one form to another, but the total amount of energy never changes.
 * Energy is not something you see. You just see the transfer of energy.
 * **Requirements for work:**
 * **Requirements for work:**
 * 1st : There must be motion.
 * Joules are the units for all forms of energy
 * How much work is done if a force of 10 N causes a block to move 2 m?
 * What if we doubled the force?
 * Power: rate at which work is done
 * ** Different types of power: **
 * Mechanical Advantage**
 * F(out) is usually the weight of the object.
 * **Pulley**: A basic kind of lever that can be used to change direction of a force.
 * **Efficiency**: The ratio of useful work output to total work input.

Efficiency = Useful work output/Total work input

**Picture****s:** Embed pictures related to your chapter. Include at least 5 pictures.





[|physics classroom]- involves potential energy,kinetic energy, mechanical energy, works, and power
 * Links: **Locate and embed at least 2 links related to the chapter.

[|Energy] a ton of helpful notes on work with links to other sites


 * Test Questions: **Create at least 8 questions in the format of multiple choice or true/false.
 * 1) True/False. The application of a force and the movement of something by that force are both cases where work is done.
 * 2) What is the correct formula for Work? (a) F=dW (b) W=1/2Fd (c) W=Fd (d) d=FW
 * 3) True/False. Power equals the amount of work done divided by the distance traveled.
 * 4) What is the unit of Power? (a) Energy (b) Watt (c) Meter (d) Newton
 * 5) True/False. The amount of gravitational potential energy possessed by an elevated object is equal to the work done against gravity in lifting it.
 * 6) What other forms of energy does Kinetic energy exist in? (a) Thermal Energy (b) Moving Energy (c) Radical Energy (d) Natural Energy
 * 7) What type of energy is it when a ball is rolling down a hill? (a) Kinetic Energy (b) Potential Energy (c) Velocity (d) All of the above
 * 8) When an object falls from a building to the ground below where does the PE and KE of the object equal each other? (a) Top (b) Center (c) Bottom (d) Not enough information

**Record the aswers to the above questions at the link below** Answers to Test Questions