N EWTON’ S L AWS
N EWTON ’ S 3 L AWS
Inertia
mass
motion
F=ma
Equal and
opposite forces
“Newton”
Push and
Push Back
relationship
Action and
Reaction
I NERTIA

An object will stay at rest or in
constant motion until a force acts
upon it. The more mass an object has,
the more inertia it has.
F ORCE IS EQUAL TO
MASS TIMES ACCELERATION

The force that an object experiences is
equal to the mass times acceleration.
F=ma
F OR EVERY ACTION THERE IS AN
EQUAL AND OPPOSITE REACTION

Push and Push Back
N EWTON ’ S 3 L AWS ???
N EWTON ’ S 3 L AWS ???
N EWTON ’ S 3 L AWS ???
N OTES Q UESTIONS :
PG . 271, 272

What is free fall?

What is Earth’s free fall acceleration?

How do you calculate weight?

Why do astronauts float in space?

How is mass and weight different?

How is mass and weight similar?

How are animals bodies designed to respond to
gravity in their environments?

What causes terminal velocity?
G RAVITY, W EIGHT, & M ASS

Gravity is the natural pull that exists between
two objects.

Gravity depends on 2 variables:

Mass

Distance
MORE MASS , MORE GRAVITY
MASS
GRAVITY
MORE DISTANCE , LESS GRAVITY
DISTANCE
GRAVITY
G RAVITY IS WHAT KEEPS THE
PLANETS GOING AROUND THE SUN
W EIGHT = MASS X GRAVITY

Force = mass X acceleration


F=ma
Weight = mass (kg) X gravity (9.8 m/s2)

w=mg

Weight is measured in Newtons because
it is a measurement of Force

1 lb = 4.4 Newtons
Objects weigh more on planet Earth than on the moon,
because the Earth is more massive.
That is to say that it has more mass!
E VERYTHING FALLS TO EARTH AT
AN ACCELERATION OF 9.8 M / S 2
W HAT IS TERMINAL VELOCITY, AND
WHAT CAUSES IT ?
M EASURE THE MASS ( IN KILOGRAMS ) AND
WEIGHT ( NEWTONS AND POUNDS ) OF THE
FOLLOWING OBJECTS
Mass (kg)
Pencil
Piece of
paper
Marble
Ball
Ruler
Cell
phone
Weight (N)
Weight (lbs)
In my own
words
define
work
illustrate
Physical Science Book
Page 284 -287
Use in a
sentence
define
In my own
words
power
illustrate
Use in a
sentence
W ORK

Work is equal to the amount of force that is
applied to an object times a certain distance.

W=Fd

Measured in Joules (J)

This hammer applies
a force to the nail for
a certain distance.
The hammer “does
work” on the nail
P OWER

Power is the amount of work that is done over a
certain amount of time.

P=W/t

Power is measured in Watts (W)
This bicyclist has a certain
amount of power. He does a
certain amount of work over
a certain amount of time.
This 500 kg car travels from 45 m/s to
100 m/s in just 2.5 seconds. In that time,
it travels 181 meters.
What is the car’s:
Acceleration?
Force?
Work?
Power?
W ORK
AND
P OWER L AB

Complete the Inquiry Lab on page 287.

Your weight in pounds X 4.4 gives you your
weight in Newtons.

If you don’t want to share your weight, that is
fine. Just use the imaginary weight of 600 N.

You have 20 minutes to complete this
assignment.

I will come around and check this in your
notebook. DO NOT TURN IT IN!!
H OW TO STUDY FOR YOUR TEST

Make sure that you have all of
your notes organized.

Read your warm-ups, notes, and
activities several times.

Make note cards for the main
ideas/key terms.
H OW TO STUDY FOR YOUR TEST

Note Cards

Inertia

Gravity, mass, weight

Newton’s Laws

Force (F=ma)

Work (W=Fd)

Power (P=W/t)