Physical Science Study Guide Chapter 12.3/12.4 Work And Energy
Atomic bond is associated with (blank) energy
Chemical
What kind of energy is used when dynamite explodes
Chemical Energy
State the law of conservation of energy
Energy cannot be created or destroyed, it can only transferred from one place to another.
Work and energy are always equal
False
Where does energy go when it seems to disappear
It changes its form
What is the formula for kinetic energy
KE=1/2mv^2
List three things the gravitational potential energy depends on
Mass, Gravity, and height
A blank system exchanges energy with the outside
Open system
What is the formula for gravitational potential energy
PEg=mgh
What is the process that transform light energy into chemical chemical energy in plants
Photosynthesis
Define mechanical energy
The form of energy associated with the position and motion of an object
What is meant by the efficiency of the machine
The work output of a machine is generally less than the work input, because additional force is needed to overcome the effects of friction and other forces. You can measure efficiency by dividing the work output by the work input.
Energy may be defined as the ability to do work
True
Is the kinetic energy of an object decreases the non-mechanical energy will decrease
True
The energy of a closed system is constant
True
The energy of an open system can increase
True
When work is done energy is transferred or transformed
True
Working energy have the same units
True
What is nuclear fusion?
a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
Define kinetic energy
energy of motion
energy cannot be created or destroyed
law of conservation of energy
What is an example of mechanical energy
riding a bike
Define potential energy
stored energy
Define energy
the ability to do work
Define efficiency
the use of resources in such a way as to maximize the output of goods and services
