Short Test Review / Chapter 8: Energy

Read the following sentences and select the correct word to fill in the blank. 1. Work is the product of the force exerted on an object and the distance the object moves.2. The unit for work is represented with the symbol J, which also means joules.3. Work is done on an object only if the object moves.4. Work is done on an object only if the force and displacement are in the same direction.5. Work can be represented with the letter W. Read each statement and select the correct answer.A person lifts a package weighing 75 N. If she lifts it 3 m off the floor, how much work has she done? The correct way to write the work formula for the problem above is: W = 3m x 75N W = 75N x 3m W = 3m + 75N W = 75N + 3m The result of the problem above is: 25J 72J 78J 225J Sort the following concepts with their definitions. Work amount of energy transferred to an object Joule unit used to calculate work Energy an object’s ability to produce change or movement Movement an object’s change in position Receiver object that receives energy Force energy exchanged between objects Source is a body or object that transfers energy Potential energy is the energy stored in matter Kinetic energy It is motion energy Position is the place where an object is located Newtons is the symbol used to identify the amount of force needed to move an object Read each statement and write K for kinetic energy or P for potential energy. P K K K P Solve the following work problem. W = force x displacement W = 25N x 50m W = 1,250J