Download Physical Science

Bell Work
Physical Science
2/6
1. List the four types of friction and Agenda:
give an example of each. Make Unit 4 Review
sure to use complete
sentences.
The acceleration due to gravity
Learning Target:
on Earth is 10 m/s2.
Unit 4 Review
2. Find the weight in Newtons of a
4.2 kg object on Earth.
3. If an object on Earth weighs 5
N, what is its mass?
4. Find the distance and
Homework/Important Dates:
displacement if a person drives
○ Egg Drop Lab due
their car 9 miles North and then
Wednesday 2/8
12 miles West.
5. Jessica jogs on a path that is 25 ○ Unit 4 Extra Credit
kilometers long to get to a park
Wednesday 2/8
that is south of the jogging path.
○ Unit 4 Test on
If it takes Jessica 2.5 hours then
Wednesday 2/8
what is her velocity?
due
Study Review for Test on Wednesday
○Create a 5” x 3” flash card of notes – don’t forget to
include formulas.
○Chapter 9
○Section reviews 1-3, Pages 341, 347, & 355,
○Page 364, Big Ideas 1-3 – Read and check knowledge
○Page 365-367, 1-4, 6-9, 11-13, 15-17, 19, 20, 22-24,
1-7
○Chapter 10
○Section reviews 1-5, Pages 377, 388, 392, & 399
○Page 406, Big Ideas 1-4 - Read and check knowledge
○Pages 407-409 except 15, 16 & 25
There is no #16!
BINGO 6x6 
Words must be
written in pen, marker
or crayon!
Bell Work
Physical Science
2/7
1. A driver starts his parked car
Agenda:
and within 5 seconds reaches Unit 4 Review
a speed of 20 m/s, as he
travels east. What is his
acceleration?
Learning Target:
2. List Newton’s Three Laws and Unit 4 Review
give an example of each.
3. A falling object has a mass of
50 kg and a acceleration of 25
m/s2. What is the force it will
Homework/Important Dates:
hit the ground with?
○ Unit 4 Extra Credit due
4. A falling object has a mass of
TOMORROW
1 kg and hits the ground with
a force of 17 N. What was its
○ Unit 4 Test TOMORROW
acceleration?
○ Egg Drop Lab due
5. What is the momentum of a
Tomorrow
500 kg object traveling at 150
m/s?
There is no #16!
BINGO 6x6 
Words must be
written in pen, marker
or crayon!
Study Review for Test on Wednesday
○Create a 5” x 3” flash card of notes – don’t forget to
include formulas.
○Chapter 9
○Section reviews 1-3, Pages 341, 347, & 355,
○Page 364, Big Ideas 1-3 - Read
○Page 365-367, 1-4, 6-9, 11-13, 15-17, 19, 20, 22-24,
1-7
○Chapter 10
○Section reviews 1-5, Pages 377, 388, 392, & 399
○Page 406, Big Ideas 1-4 - Read
○Pages 407-409 except 15, 16 & 25
Bell Work
Write “No bell work today”
Physical Science
Agenda:
Unit 4 Test
Clear off your desk except :
1. Unit 4 Study Guide
Learning Target:
Unit 4 Test
2. A pencil
3. Egg drop
4. Extra Credit
Homework/Important Dates:
○ None
2/8
Bell Work
1. Two identical objects are
dropped from 10 m and
20 m. Which one will hit
the ground with more
energy? Why?
2. Two objects are dropped
from 10 m. One masses
10 kg, and one masses
20 kg. Which one will hit
the ground with more
energy? Why?
Physical Science
2/9
Agenda:
Energy Notes
KE and PE WS
Learning Target:
I can describe the concept of energy.
I can calculate the KE and PE of an object.
I can apply the law of conservation of
energy.
Homework/Important Dates:
○ Kinetic and Potential
Energy WS due
Thursday 2/16
Physical
Science
Notes
Energy
Work and Energy
○In physics, work is done when
an object is caused to move a
distance.
○Lifting a book or hitting a
baseball are examples of
work.
○The ability to do work or cause
change is called energy.
○Wind can push leaves around,
so it can do work, so it has
energy.
○In the SI (metric) system, the unit
for both work and energy is the
joule.
Kinetic Energy
○Kinetic energy is the energy an object has due to its
motion.
○Kinetic energy depends on the objects mass and speed.
○The larger the mass, the greater the energy.
○The faster the object is traveling, the greater the
energy.
Calculating Kinetic Energy
K.E. = ½ mv2
○The formula for kinetic energy is:
Kinetic Energy
1
2
Mass
(Velocity)2
○Kinetic energy is measure in joules (if the mass
is in kg and the velocity is in m/s).
○Looking at the formula, you can see:
○Doubling the mass will double the kinetic
energy.
○Doubling the velocity will quadruple the kinetic
energy, because velocity is squared in the
equation.
Calculating Kinetic Energy
○What is the kinetic energy of a 8 kg bowling ball
traveling at 9 m/s?
1
2
Mass
(Velocity)
Kinetic Energy
2
1
2
8
kg
(9
m/s)
Kinetic Energy
2
Kinetic Energy
1
2
8 kg
Kinetic Energy
1
2
648 joules
Kinetic Energy
324 J
81 m2/s2
Potential Energy
○Potential energy is the
stored energy that results
from the position or shape
of an object.
○Examples:
○A car parked at the top
of the hill.
○If the car were
pushed, it would gain
kinetic energy.
○A coiled spring.
○If the spring was
released it would gain
kinetic energy.
Types of Potential Energy
○There are two types of
potential energy:
○Elastic potential energy
○Gravitational potential
energy
○Elastic potential energy
is the energy of objects
that can be stretched or
compressed.
○Examples:
○The bow of an archer.
○Spray paint.
Gravitational Potential Energy
○Gravitational potential energy is related to an object’s height.
○An object’s gravitational energy depends on its weight and its height
relative to a reference point.
○The formula for gravitational energy is:
GPE
Weight
Height
OR
Acceleration
due to gravity
○GPE is measured in joules.
GPE
Mass
G.P.E. = Wh
Or
G.P.E. = mgh
Height
○Gravitational potential energy is based on the weight and height of
the object.
Calculating GPE
○What is the gravitational potential energy of a 11,000 Newton car
that is at the top of a 500 m hill?
GPE
Weight
Height
GPE
11,000 N
GPE
5,500,000 Joules
500 m
Calculating GPE
○What is the gravitational potential energy of a 2 kg bird
that is flying at a height of 150 m? (g = 10 m/s2)
GPE
Mass
GPE
2 kg
GPE
3,000 J
Acceleration
due to gravity
10 m/s2
Height
150 m
Mechanical Energy
○The mechanical energy of an
object is its combined kinetic and
potential energy.
Kinetic
Mechanical Energy
energy
○To find the mechanical energy of an
object, you should find the kinetic
energy and the potential energy
and then add them.
○To find the mechanical energy, you
need to know the weight, mass,
speed and height of the object.
Potential
energy
Energy Transformations
○Any object that rises or falls
experiences a change in its
kinetic and gravitational potential
energy.
○Imagine a juggler.
○As the oranges fall, the lose
height and gain speed, so their
potential energy is being
changed into kinetic energy.
○As the oranges rise, they gain
height and lose speed, so their
kinetic energy is being changed
into potential energy.
Energy change in a pendulum
○A pendulum continuously transforms energy from kinetic to potential
and back.
○At the highest points in its swing, it has all potential energy and
no kinetic energy.
○At the lowest point, it has all kinetic energy and no potential
energy.
Law of Conservation of Energy
○The law of conservation of energy states that energy
cannot be created or destroyed, only transferred from one
form to another.
○When playing pool, the cue ball is shot at a stationary 2 ball.
The cue ball has energy.
○When the cue ball hits the 2 ball, the energy transfers from
the cue ball to the 2 ball, sending the 2 ball into motion.
○The cue ball loses energy because the energy it had has
been transferred to the 2 ball, so the cue ball slows down.
Physical Science
Warm Ups:
1. Find the kinetic energy of a
10 kg object traveling at 5
m/s.
2. What is the potential energy
of a 5 N object at a height of
50 m?
3. What is the potential energy
of a 16 kg object at a height
of 10 m on Earth? (g =
10m/s2)
2/10
Agenda:
KE and PE WS
Energy Foldable
Learning Target:
I can describe the concept of energy.
I can calculate the KE and PE of an object.
I can apply the law of conservation of
energy.
Homework/Important Dates:
○ Kinetic and Potential
Energy WS due
Thursday 2/16
○ Energy Foldable Due
Thursday 2/23
Top
Law of
Conservation
of Energy
Bottom
Elastic Forces
Gravity
Transfer in
Energy
Height
Friction
Kinetic
Energy cannot
be created or
destroyed
Motion
Heat Energy
Weight
Potential
Formulas required for those circled in Green
Definitions
Pictures
Work
Energy
Kinetic energy
Potential energy
Gravitational potential energy
Elastic potential energy
Mechanical energy
Law of conservation of energy
Joule
Kinetic energy formula
Gravitational potential energy formula