Forces and Energy

Florida International University Name:____________________ Anett Vill Panther ID:__________________ 6353398 Worksheet 1.5 Forces and Energy 1. You have an isolated system of two massed objects. a. Reflecting back on the example of Katie dropping the tennis ball, how do you think a gravitational force would change with respect to distance between the two massed objects (the ball and the ground)? As the distance the gravitational force between the two massed increases While , as the force gravitational the . inversely is . decreases force related This to is decreases objects distance increases Gravitational because distance b. Explain in words what you think would happen to the potential energy as the massed objects move together. Why does the potential energy change in this way? The potential together is , so energy to as the As , . the as is object falls is force as at a moves and it transfers as gravitational decreased energy potential decreases falls it energy to acting the objects higher closer kinetic more the point together energy on the two closer . higher the This it potential is due (Ball-Earth) masses . c. After examining the axes below, now draw a graph indicating how the potential energy of the system changes with distance between the two masses. We will define the potential energy of the two masses at a great distance (where they don't interact) as starting at the distance axis. (Hint: Where would objects at a great distance be located on your distance axis? This is the starting point.) - n Potential energy 3 or E Distance between objects (r) E As distance decreases Potential energy decreases & & d. Since the system is isolated, what do you think will happen to the kinetic energy as the potential energy changes? The of Kinetic energy . energy will increase as the potential energy decreases . Conservation Florida International University Anett Vild Name:____________________ Panther ID:__________________ 6333398 2. Now let us think about an isolated system consisting of two oppositely charged species. a. How do you think an electrostatic force would change with respect to distance between two oppositely charged species? (Reflect back to the electric field hockey simulation if needed). The one the has another electro a . charged oppositely two In regards magnetic inversed force To . species distance would the closer And , the further proportional relationship inherity they be are the the weaker attracted to (least distance electromagnetic stronger the force . So , it is . b. Explain in words what you think would happen to the potential energy as the two opposite charged species move together. Why does the potential energy change in this way? As the as two attraction distance oppositely charged species increases decreases , so then Potential more Kinetic together energy takes decreases energy the over while potential as the Kinetic energy attraction energy decreases . increases because Therefore , increases Potential energy c. After examining the axes below, now draw a graph to show how the potential energy of the system changes with distance between the two opposite charged species. We will define the potential energy of the two charged objects at a great distance (where they don't interact) as starting at the distance axis. (Hint: Where would objects at a great distance be located on your distance axis? This is the starting point.) Distance between charges (r) d. Since the system is isolated, what do you think will happen to the kinetic energy as the potential energy changes? Because energy Kinetic it's the of law constant increases so . as They conservation potential have of decreases an inverse relation ship . - Florida International University Name:____________________ Anet+ Vil Panther ID:__________________ 0609131153 3. Now you have an isolated system consisting of two charged species of the same sign. a. How do you think an electrostatic force would change with respect to distance between two charged species of the same sign? (Reflect back to the electric field hockey simulation if needed). distanc As electrostatic force decreases , decreases distanc as increase electrostatic force and increases b. Explain in words what is happening to the potential energy as the two charged species of the same sign move together. Why does the potential energy change in this way? As to they the together move charges repelling more the the closer potential energy they are increases due . Potential energy c. After examining the axes below, now draw a graph to show how the potential energy of the system changes with distance between the two charged species of the same sign. (Hint: Where would objects at a great distance be located on your distance axis? This is the starting point.) Distance between charges (r) 4. Comparing the potential energy graphs in 2c and 3c, do they look similar or different? Explain. They Look with graph decreases while and salme because graph in basically are has a decrease harges opposing the different , They that 2 charges the displays case In P E . z opposites because the graph RE as distance decrease an repulsion increase causes opposing charges decreases a kinetic of , P With while . has (22) . E more hence as distance potential attraction increases . Energy . .