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Integrated Science
Unit 2, Chapter 5
Unit Two: Work and Energy
Chapter 5 Work, Energy and Power
5.1
Work
5.2
Energy Conservation
5.3
Energy Transformations
Chapter 5 Learning Goals

Calculate the amount of work done by a simple
machine.

Use units of joules to measure the amount of work
done.

Analyze the effects of changing force or distance in a
simple machine.

Calculate the efficiency of a machine.

Calculate power in machines.

Discuss perpetual motion machines.
Chapter 5 Vocabulary Terms

chemical energy

electrical energy






law of conservation of
energy

nuclear energy

potential energy watt

power work

radiant energy

radiation

solar power
energy transformations
heat efficiency
horsepower
joule energy
kinetic energy
5.1 Work
Work (joules)
Force (N)
W=Fxd
Distance (m)
5.1 Work
Key Question:
What happens when you multiply forces in
machines?
*Read text section 5.1
BEFORE Investigation 5.1
5.2 Power
Power (watts)
Work (joules)
P =W
t
Time (sec)
5.2 Energy


Energy is the ability to do work.
Any object that has energy has the ability to
create force.
 Energy

is measured in the same units as work.
A joule is a unit of force that acts over a
distance.
5.2 Potential Energy
Mass (kg)
Potential Energy
(joules)
Ep = mgh
Height (m)
Acceleration
of gravity (m/sec2)
5.2 Kinetic Energy
Kinetic Energy
(joules)
Ek = 1 mv2
2
Mass (kg)
Speed (m/sec)
5.2 Energy Conservation
Key Question:
What is energy and how
does it behave?
*Read text section 5.2
BEFORE Investigation 5.2
5.3 Energy Transformations
Energy transformations
occur between different
types of energy.
— radiant energy
— electrical energy
— chemical energy
— nuclear energy
Energy Transformations
in a Power Plant
Power plants convert
chemical energy into
electrical energy.
1. chemical energy
2. heat energy
3. mechanical energy
4. electrical energy
5.3 Energy Transformations
Key Question:
Where did the energy go?
*Read text section 5.3
BEFORE Investigation 5.3