In Friday’s gizmo over weight and mass which
planet had the most gravity, why is this?
With your partner, think of an example of an
object in your daily life that keeps on moving
forever without anything pushing it along.
Chapter 2-2 Notes
Newton’s Laws of Motion
Newton’s first law states that:
An object at rest remains at rest,
and an object in motion remains in
motion at constant speed and in a
straight line unless acted on by an
Briefly explain what this Once something
is moving then it
will keep moving
it along, until
pushes or pulls it.
At rest example:
1) A golf ball balanced on
2) A ball on the floor
In motion example:
1) A bowling ball rolling
2) A person in a moving
car that stops
But objects don’t stay in True. Friction does not
motion forever ……. allow objects to stay in
motion forever. But,
friction is an example of
so Newton’s 1st law still
the tendency of all
objects to resist any
change in motion.
Example – when a car
stops, your inertia
causes you to go
How does mass impact Small mass = less
Large mass = more
Trying to throw a
marble or trying to
throw a bowling ball
Newton’s second law of
motion states: The
acceleration of an object
depends on the mass of the
object and the amount of force
In other words …….. Acceleration depends
on how heavy an object
is and hard you push.
on mass and force.
State the equation used. F=ma when F is equal
to force or weight, m is
Draw the circle from the equal to mass and a is
chalkboard here. equal to acceleration.
This solves for force.
A=F/m this solves for
Use this to help you acceleration
remember the formulas.
M = F/a this solves for
Remember!! Write the equation, plug it in, and
Freddie is skiing. What’s his force if his mass is
20kg and is accelerating at a rate of 5 m/s²?
20 kg x 5 m/s² =
2) Jon is pushing a 350 kg crate with a force of
5N. What is the acceleration?
5 N ÷ 350 kg =
3) Jenny dropped a bowling ball that falls to the
ground with a force of 12 Newtons. The
acceleration of the bowling ball is 9.8 m/s²
due to gravity. What is the mass?
12 N ÷ 9.8 m/s² =
Write 2 original (don’t use the car example
from the notes) examples of inertia.
Newton’s third law
Whenever one object
exerts a force on a
second object, the
second object exerts an
equal and opposite
force on the first.
Or briefly stated as ….. All forces act in pairs. If a
force is exerted another
force occurs that is
equal in size and
opposite in direction.
Action Reaction Some examples are:
action force = hand
reaction force = water
Can you always see the No – this occurs in
action/reaction? nonmoving objects also
Example = you sitting in a