Physical Science Study Guide Chapter 12.3/12.4 Work And Energy

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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


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