Date Pd
Practice Representing Systems and Change
For each of the following problems, choose your system so that energy is conserved but do not place
anything in the system other than those elements which are essential to include energy conservation.
a. Specify the system, then draw a system schema.
b. Add a written description of the changes represented.
c. Construct Energy Bar Charts for the initial and final states of your system. Be sure to label the
“L's” in your charts and complete the energy-flow diagram
1. A student lifts some books from the bottom of his locker.
a. System Schema:

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation