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## Energy

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### UNIT 7 Energy & Work – PowerPoint PPT presentation

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Title: Energy

1
Unit 7
• Energy Work

2
Energy
• Energy the ability to do work
• (the ability to cause a change)

3
Mechanical Energy
• Two types of mechanical energy
• Potential Energy - energy of position
• Kinetic energy energy of motion

4
Kinetic Energy
• Kinetic energy energy of motion

5

6
Kinetic energy
• What if the mass is doubled?
• What happens to the kinetic energy if the
velocity is doubled?

7
Potential Energy
• Potential energy energy of position/location
• Chemical potential
• Elastic potential
• Gravitational potential
• Electric potential
• Nuclear potential

8
Gravitational Potential Energy
9

10
Gravitational Potential Energy
• What happens to the gravitational potential
energy if the mass is doubled?
• What if the height is doubled?

11
Conservation of Energy
• Law of Conservation of Energy
• Energy cannot be created or destroyed. It can
be transformed from one form to another, but the
total amount of energy never changes.

12
Pendulum
13
Starts out not moving
14
Starts out not moving
15
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25
Total energy kinetic potential
Total energy of the pendulum is conserved
26
Conservation of Energy
• Law of Conservation of Energy
• Energy cannot be created or destroyed. It can
be transformed from one form to another, but the
total amount of energy never changes.
• - What are some examples of transformation of
energy?

27
Different starting conditions
• What if I start the pendulum higher?

Before
Now
28
Different starting conditions
• What if I start the pendulum higher?

Before
Now
29
Different starting conditions
• What if I push the pendulum instead of just
letting go of it?

30
Different starting conditions
• What if I push the pendulum instead of just
letting go of it?

31
Rollercoaster
32
What would the energy bar chart look like?
33
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34
What would the energy bar chart look like?
35
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36
What would the energy bar chart look like?
37
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38
When does a pendulum have the most Total Energy ?
39
Energy
• Energy initial Energy final
• Scenario A boulder resting on a hilltop
• What kind of energy does the boulder have at the
top of the hill?
• What will happen to that energy as the boulder
rolls down the hill? Why?
• What kind of energy does the boulder have as it
rolls down the hill?
• What will happen to this energy as the boulder
rolls down the hill? Why?
• What would happen to the two types of energy
mentioned if the hill on which the boulder sits
was much taller?

40
Work
• Two things must occur for work to be done.
• 1- a force must be applied
• 2- something must move as a result of that
force
• Work force x distance
• Or Wfd unit Nm or J (joules)

41
Power
• Power rate at which work is done.
• P W
• t
• (unit is 1 J/s OR 1 W (watts))
• (i.e. 40 W 40 J/s)
• 1 horsepower 746 Watts