Simple Machines & Energy Test Review Sheet - KEY PDF

key Name__________________Period_____ Test Review Sheet Chapter 6 Materials to Study: CHAPTER 6 & Notes - Lab: Levers - Lab: Ropes and Pulleys...

key Name__________________Period_____ Test Review Sheet Chapter 6 Materials to Study: CHAPTER 6 & Notes - Lab: Levers - Lab: Ropes and Pulleys - Lab: Gears - Lab: Work, Power, and Energy & Practice Problems - Lab: Energy Transfer & Kinetic and Potential Energy Practice Problems - Lab: Energy of a Toy Car - Lab: Conservation of Energy (Marble Roller Coaster) 1. What are the four simple machines we’ve talked about in class? Fill out the table below. Type of machine Equality Mechanical Advantage (GIVEN on test) (MEMORIZE) no units Levers Fixli Fox Lo ma Ropes & Pulleys Fix ropes Fo MA É ropes Gears Tix Ri ToxR did not learn MA for this machine Ramps no equality MAY 2. What are the 2 types of energy we’ve talked about? Write the equations for them below, and the units used for each variable in the equations. These equations will be GIVEN on the test. a. Potential energy is energy of ( position / motion ) PE = Mgh Joules b. Kinetic energy is energy of ( position / motion ) KE = Yzmr Joules 3. Write the equations for work and power below, and the units that should be used for each variable in the equations. These equations should be MEMORIZED for the test. F xd Joules Yoffe Work = Power = Watts Force distance 4. Ms. D applies 42 N force to a box. The box moves 4 m. How much work was done? W 42 4 116851 a. If Ms. D did the work in 22 seconds, how much power was required to move the box? 16282 47.61 5. Ms. D lifts a 23 kg meteorite 4m to place it on a shelf. a. How much potential energy does it have? How much kinetic energy? PE mxgxh 3 19.8724 1 7901.6 b. The meteorite falls off the shelf and reaches a velocity of 6.5 m/s. What is its kinetic energy? KE Yzmr 7485.95J 151123 6 s c. Will the meteorite reach 11 m/s before hitting the floor? ( yes / no ) i. Explain your answer KE Yz 23 11 No since there isn'tthat 1,391.52 much PE 6. A 12 kg ball is rolling down a ramp. a. When it reaches a velocity of 8 m/s, what is its kinetic energy? KE 421127187 38456 b. When the ball was at rest at the top of the ramp, it had 430 J of energy. What was the height of the ramp? 430 12 9.8 17 47 471 3.662 c. If the ramp is 6 m long, what is the mechanical advantage of the ramp? MA G 366 D 7. You have an input gear with 16 teeth and an output gear with 36 teeth. If you rotate the output gear 15 times, how many times will the input gear rotate? Tix Ri Tox R 167 12 e is 733.714in 8. A pulley has a mechanical advantage of 6. A child can only use 40 N of force but wants to lift a 271 N box full of toys. Will he be able to lift it? If not, what type of pulley will be able to lift it? MA EE ropes É  9. Draw the 3 classes of levers below, and label the fulcrum, Fi , and Fo. Class 1 Class 2 Class 3 Fo Fi Fo Fi Fi Fo Fulcrum in middle Fo in middle F in middle 10. A machine uses 300 Watts of power to push an 89 kg block in 20 seconds. a. How much energy did it use to move the block? 300 8 76,00050 b. Assume the block was on a frictionless surface. What was the kinetic energy of the block after the machine pushed it? Energychanges from KE PE so 6,000J is gained by the box c. The block begins to climb a ramp. What is the highest height it can reach before running out of energy? It has 60005 of PE so 6000 mgh 696 4 6000 189 9 8 h 6000 872.217 11. A class 2 lever has a load of 60 N at 4 m from the fulcrum. A machine uses 15 N to lift it. a. How far will the input force need to be from the fulcrum? Draw the lever below. Exlo Fix Li List 60714 5 Li b. What is the mechanical advantage of the class 2 lever above? III gon Fi kN 6 MA FI 5 41 or MA El Liston c. The same load is placed on a class 3 lever, 5 m from the fulcrum. Will the machine be able to lift it? Explain. Class Fi to New to Fxl Fixli In order to lift the 60N load Li would need to be at least 20m 60 S XS Li from the fulcrum. This isn’t possible for a class 3 lever since Li in class 3 levers need to be smaller than Lo Lis20m