University:
High School
Course:
High School Physics
Academic year:

2022
Views:

329

Pages:

2
Author:

SpaceCadet101

Name: __________________________________________________________ Date: ________________________ Period: _________ Conservation of Energy Calculations The law of conservation of energy tells us that energy can never be created or destroyed—it is just transformed from one form to another. The total energy after a transformation (from potential to kinetic energy, for example) is equal to the total energy before the transformation as long as no energy is non-mechanical energy. We can use this law to solve real-world problems. 1. A 3.0 kg toy dump truck initially moving along a level track with a speed of 2.0 m/s starts up a ramp. a. Draw a energy bar chart of the truck before it is on the ramp and when it is at the top of the ramp below. b. Calculate how high up the ramp the truck travels. 2. A 20 N ball rolling along a flat surface starts up a hill. a. Draw an energy bar chart of the ball before it is going up the hill and when it has reached a height of 0.63 m and a velocity of 2 m/s. b. What was the initial velocity of the ball before it started up the ramp? 3. A 500 kg roller coaster starts from rest at the top of an 80.0-meter hill. a. Draw an energy bar chart of the roller coaster when it start at the top of the hill and when it has has gone down the hill halfway. b. What is its speed it is halfway down the hill? 4. A 2.0 kg ball is tossed straight up with a kinetic energy of 196 joules. How high does it go? 5. A rock rolls is dropped off the edge of a cliff. If it is traveling at a speed of 24.2 m/s when it hits the ground, what is the height of the cliff? 6. A roller coaster starts from rest at point A. What is its speed at point C if the track is frictionless? 7. A 2kg mass is hanging from a string and acts as a pendulum as shown below. Fill in the data table below for the mass. PE KE velocity Total Energy A B C D 8. A 50 kg gorilla is sitting on the limb of a tree 4 meters above the ground. After he jumps off the limb, what is the speed of the gorilla when he is 1.35 m above the ground?