University:
University of California, Berkeley
Course:
PHYSICS 5A | Introductory Mechanics and Relativity
Academic year:

2024
Views:

49

Pages:

2
Author:

Cirioloiou

kinetic and potential energy worksheet 1. you serve a volleyball with a massive 2.1 KG. The ball leaves your hand with a speed of 30 m/s The ball has kinetic energy calculate it: 1/2 x 2.1kg x 30m/s^2 = 945 Joules 2. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 kg. The carriage has potential energy. Calculate it: 12 kg x 9.8 m/s^2 (gravity) x 21m = 2,469.6 J 3. A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. The car has kinetic energy. Calculate it: 1/2 x 1,120kg x 40m/s^2 = 896,000 J 4. A cinderblock is sitting on a platform 20 m high. It weighs 79 kg. The Block has potential energy. Calculate it: 79 kg x 9.8m/s^2 x 20m = 15,484 J 5. There is a Bell at the top of a tower that is 45 m high. The beltway is 190 kg. The bill has potential energy. calculate it: 190 kg x 9.8m/s^2 x 45 m = 83,790 J 6. A roller coaster is at the top of a 72 m hill and weighs 966 kg. The coaster at this moment has potential energy. calculate it: 966 kg x 9.8 m/s^2 x 72m = 681,609.6 J 7. determine the amount of potential energy of a 5.0 kg book that is moved to three different shelves on a bookcase. The height of each shelf is 1.0 m, 1.5 m, and 2.0 m.: 5 x 9.8 x 1 = 49 J 5 x 9.8 x 1.5 = 73.5 J 5 x 9.8 x 2 = 98 J 8. you're on in-line skates at the top of the small hill. Your potential energy is equal to 1000 J. The last time you checked, your mass with 60.0 kg What is the height of the hill? If you start rolling down this hill, your potential energy will be converted to kinetic energy. At the bottom of the hill, your kinetic energy will be equal to your potential energy at the top. Calculate your speed at the bottom of the hill: 1000 = 9.8 x 60.0 1000 = 588h h = 1.7m height is 1.7m 1000 x 9.8 = 1.699 1.699 is the speed 9. BONUS A 1.0 kg ball is thrown into the air with an initial velocity of 30 m/s. A. How much kinetic energy does the ball have? B. How much potential energy does the ball have when it reaches the top of 1/2 the ascent? C. How high into the air did the ball travel?: A. 1/2 x 1.0 x 30^2 1/2 x 900 = 450 J B. 450 J = 9.8m 45.9m = h C. 45.9? not sure 10. What is the kinetic energy of a 2000 kg boat moving at 5.0 m/s?: 1/2 x 2,000 x 5^2 1000 x 25 = 25,000 J 11. this graph shows a ball rolling from A to G. The ball starts at point A and rolls to point G. what letter does the ball have the greatest kinetic energy? Which letter shows the ball when it has the maximum potential energy? which letter shows the ball when it has the least potential energy? why is G slightly slower than point A? In other words, why couldnt the ball go back at the height at which it was started?: answer the first question is D Answer to the second question is A Answer to the third question is D Answer to the fourth question is either gravity or high friction 2/2