Download Introductory Physics

Introductory Physics
9th Grade Science
Mr. Wenger
Click to continue
Who is Isaac Newton?
Scientific Notation
Newton’s First Law of Motion
Newton’s Third Law of Motion
Click Here For Instructions!
Newton’s Second Law of Motion
Newton’s Law of
Universal Gravitation
Ready for the quiz? Click here!
Newton’s First Law of Motion
– The Law of Inertia
An object as rest stays at rest, while an object in
motion stays in motion with the same velocity
and acceleration. This is true, unless an outside
force acts onto such object. For example, if you
set down your backpack on the floor, the
backpack will not move unless you or something
else picks it up or exerts another force on it.
Return to Menu
Newton’s Second Law of
Motion
Newton’s Second Law of motion can be summed
up in an equation he created: F = ma. Where F is
force, m is mass, and a is acceleration. This
equation shows that Force is proportional to
acceleration and in the same direction of the net
force. So in short, this equation states that
when a force acts onto a mass, acceleration is
produced.
Return to Menu
Newton’s Third Law of
Motion
Newton’s third law is probably one of the most
commonly heard laws. For every action, there is an
equal and opposite reaction. This means, that for
every force that is applied to anything, there is an
equal and opposite reaction at that exact same point.
For example, if you lean up against a wall, the wall is
pushing up against you to keep you from falling over.
Return to Menu
Newton’s Law of Universal
Gravitation
This law also has a formula shown in the picture below.
Where F is for force, m stands for masses of the two
objects, and G is the gravitation constant. This law
states that any two objects in the entire universe, as
long as they have mass, are attracted to each other by a
force! That’s right, the computer and yourself have an
attraction to each other at any point in time, though
the force may be infinitesimal, it’s still there!
Return to Menu
Who is Isaac Newton?
Isaac Newton was and still is a very famous English
physicist. He was also widely know for his mathematics in
his own time. Newton was one of the first scientists to
develop calculus. Newton’s calculus was eventually
disregarded and proved wrong, but led to the calculus we
use today. Newton is most widely known for his Laws of
Motion, and his Law of Universal Gravitation which you
will learn about in this activity.
Return to Menu
Scientific Notation
Scientific notation is very important, it is a way to shorten
the writing of numbers so we don’t need to take up an
entire page writing one answer. For instance, the sun is
149600000000 meters away from the Earth. We can
express this as so: 149.6 x 10^9, this means that you will
move the decimal place over one place and if there isn’t a
number currently there, add a zero to the end of the
number.
Return to Menu
If the mass of the Earth is 5.972 x 10^24kg, and the
mass of the sun is 1.989 x 10^30 kg. The distance
between the Sun and the Earth is 149.6 x 10^9 meters,
what is the force that the Sun and the Earth enact on
each other? Also, use G = 6.67 x 10^-11 (m^3/kg s^2)
Answers are expressed in unit of force Newtons (N)
A) 5.30 x 10^33 N
B) 3.54 x 10^22 N
C) 5.31 x 10^32 N
D) 17.8 x 10^-9 N
A) 5.30 x 10^33 N
Remember the equation for universal
gravitation is F = G (m1 * m2)/r^2. Do not
forget to square your distance from the Earth
to the Sun, go ahead and give it another try!
Return to Question
B) 3.54 x 10^22 N
Great job! Please continue to the
next slide to finish this activity.
Click to Continue
C) 5.31 x 10^32 N
Don’t forget the gravitation constant
G in your formula! Remember that
the formula is F = G(m1 * m2)/r^2.
Return to Question
D) 17.8 x 10^-9 N
Woops, don’t forget the equation is
F = G(m1 * m2)/r^2. Don’t forget to
use both masses next time!
Return to Question
Instructions
• Click the links on the menu to learn
more about the designated topic.
• Read about all the topics
• When you are ready, proceed to the
quiz which is accessed from the menu.
• Finish the quiz and proceed to follow
designated instructions.
Return to Menu
Congratulations!
Now that you’re finished, please click the
link to return to the title slide for the next
person.
Return to Title Slide