Work-Energy Theorem Worksheet #7 G12-2

Master Work-Energy Theorem! Solve physics problems on kinetic & potential energy.

Name: Grade and Section: Work and Energy Watch the video and take down notes. Work and Energy Sample Problems Reading Articles Read the articles below by clicking the preview paragraphs. Definition and Mathematics of Work Calculating the Amount of Work Done by Forces Work, Energy, and Power Kinetic Energy Potential Energy Multiple Choice Read the questions carefully and choose the letter for your answer. Manuel is carrying a 10lb bag of fertilizer a distance of 5 meters to the table. Is Manuel doing work? yes no I do not know A weightlifter pulls 100 lbs of weight above his head and holds them there for 1 minute. Is the weightlifter doing work? yes no I do not know Tammy is pushing her 3 ton car with a force of 25 Newtons a distance of 10 meters. What is the amount of work being done? 7,500 J 30 J 250 J The further you push an object in the same direction of the force, the more work you do. true false The further you carry an object the more work that is done. true false Activity 3 required more work than Activity 1, but Activity 3 did not require more work than Activity 2. Activity 1 and Activity 3 required the same amount of work. Activity 2 required the most work. The athlete does no work on either the 200 N weights or the 400 weights. The athlete does no work on the 200 N weights but does work on the 400 N weights. The athlete does work on both the 200 N weights and the 400 N weights. The athlete does work on the 200 N weights but does no work on the 400 weights. Fill in the facts below. Choose your answer from the Text Word Bank. 1. The SI unit for work is Joule. The reason why is because work involves aforceand distance moving in the same direction.2. The SI Unit for force is Newton.3. The SI Unit for distanceis meter.4. The formula for kinetic energy is (1 The formula for potential energy is mgh.6. Energy can not be created or destroyed. Problem Solving Amy uses 20.0 N of force to push a lawn mower 10.0 m. How much work does she do? 200. J What is the mass of a baseball that has a kinetic energy of 105 J and is traveling at 10.0 m 2.10 g A cart is moved across a frictionless floor by a rope that is inclined 30.0 degrees above horizontal. The tension in the rope is 50.0 N. How much work is done in moving the cart 10.0 meters? 433 J How much force is exerted by a vacuum cleaner pulled 15.0 m at an angle of 30.0-degrees above the horizontal with 240.0 J work done? 18.5 N A baseball is moving at a speed of 40.0 m and has a kinetic energy of 160.0 J. What is the mass of the baseball? 200. g An 8.00 kg science book is resting on the top of a 2.00 meter high book shelf. What is the potential energy of the book?(g=9.80 m 157 J A 75.0 kg bobsled is pushed along a horizontal surface for two athletes. After the sled is pushed a distance of 4.50 m starting from rest, its speed is 6.20 m Using the Work-Kinetic Energy Theorem, find the magnitude of the net force on the bobsled. 320. N A 3.80 kg toys falls from a counter that is 1.40 m high. What is the speed of the toy just before it hits the ground? (KE=PE) 5.24 m A 10.0 kg box is accelerated from 2.00 m to 4.00 m What is the amount of work needed to accelerate the box? 60.0 J Calculate the force necessary to move a 56.0 kg cart from rest to 25.0 m in 133. m. 132 N If a 1.30x103-kg car has been lifted so it has 19500 J of potential energy, how high was it lifted up? (g=9.80 m 1.53 m Farah has a mass of 47.0 kg and exerting 587.5 J while moving going to the right. What is Farah's velocity? 5.00 m A 12.0 kg book is pushed from rest to a final velocity of 10.0 m The book travels 14.0 m. How much force was the book pushed with? 42.9 N What is the kinetic energy of a jogger with a mass of 65.0 kg traveling at a speed of 2.50 m 203 J If 68.0 J were necessary to move a 4.00 N crate, how far was the crate moved? 17.0 m 45.0 J of work were done on the object that moved 5.00 m. How much force was applied to the object? 9.00 N