Unit 4 Test Review Sheet - 2024 PDF

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Aveanna Agbunag

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physics simple machines energy work and power

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This is a physics test review sheet covering types of simple machines, equations for potential and kinetic energy, calculations for work and power. It has multiple practice problems.

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Name__________________Period_____ Aveanna Agbunag P8 Test Review Sheet Chapter 6 Materials to Study: CHAPTER 6 & Notes - Lab: Levers -...

Name__________________Period_____ Aveanna Agbunag P8 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) Levers Fi Li Fo Lo MA of ropes Fo of ropes Ropes & Pulleys Fi MA 7 Gears Ti Ri To Ro did not learn MA for this machine Ramps no equality MA t 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 = m hg b. Kinetic energy is energy of ( position / motion ) KE = mv 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. Work = Power = Force Distance 4. Ms. D applies 42 N force to a box. The box moves 4 m. How much work was done? 42N 4m 168J a. If Ms. D did the work in 22 seconds, how much power was required to move the box? 8 watts or 7.63 watts se 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.IS c PE is the highest PE 901.65 PEP E b. The meteorite falls off the shelf and reaches a velocity of 6.5 m/s. What is its kinetic energy? KE L 23.6.52 KE 485.8757486J c. Will the meteorite reach 11 m/s before hitting the floor? ( yes / no ) i. Explain your answer I will not because 6.5 m s is the max it can go 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? 845 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? YE.IMJ.h 430 129.8 3.65m 4m c. If the ramp is 6 m long, what is the mechanical advantage of the ramp? MA 1.5 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? s3 ri 34 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? The child MA of ropes 21 6.7 cannothavelift Hewill it to have a pulley system that is more than 7 9. Draw the 3 classes of levers below, and label the fulcrum, Fi , and Fo. Class 1 Class 2 Class 3 if I f Ff tf Haram falaam fulcrum Fulcrum inthe middle Fointhe middle Fiinthemiddle 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? work F d 300 20 600 b. Assume the block was on a frictionless surface. What was the kinetic energy of the block after the machine pushed it? 189 4 45 881.211 881J c. The block begins to climb a ramp. What is the highest height it can reach before running out of energy? 300 20 89 9.8 6000 872 2 6.87 7m 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. F Fi m is b. What is the mechanical advantage of the class 2 lever above? MA 95 4 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. 15 Li 60 5m fi I 300 15 20 and No it can only lift ISN not more than that

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