# Physics 2 Unit 3

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } How is work calculated? Work = Force x (distance in the direction of the force) What is work measured in? Work is measured in joules How is power calculated? Power = Energy ➗ time What is meant by gravitational potential energy? Gravitational potential energy is the energy stored in an object because of its position I'm a gravitational field How is the change in gravitational potential energy calculated? Ep = m x g x h Ep = change in gravitational potential energy /Jm = mass /kgg = gravitational field strength per kilogram / N/Kgh = change in height in metres How is kinetic energy calculated? Ek = 1/2 x m x v" (squared) Ek = kinetic energym = massv = speed How is momentum calculated? P = m x v P = momentum kgm/sm = massv = velocity What is meant by the conservation momentum? The total momentum before the interaction is equal to the total momentum afterwards - providing that no external forces act on them What is the function of the crumple zone in cars? Crumple zones in cars are designed to fold in a collision. This increases the impact time and so reduced the force on the car and people in it AuthorRvynvega ID219081 Card SetPhysics 2 Unit 3 DescriptionWork Energy Momentum Updated2013-05-11T18:12:59Z Show Answers