Download to move. Inertia Acceleration acceleration decreases. Action

Newton’s Laws of Motion Notes
Isaac Newton is the scientist who discovered the Laws of Motion.
Balanced forces are forces that cancel each other out, so there is no movement of the
object.
Unbalanced forces occur when one force is stronger than another, which causes the object
to move.
Law
1st
Law of
Inertia
Definition
an object in
motion will stay in
motion, and an object at
rest will stay at rest
unless a force acts on
the object
2nd
Law of
Acceleration
Force, mass, and
acceleration are related.
If force increases,
acceleration
increases. If mass
increases, acceleration
decreases.
3rd
Law of
Action /
Reaction or
Interaction
For every action, there
equal and
opposite reaction.
is an
In other words…..
If something is
moving, it will
continue to move; if
something is not
moving, it will not
move UNLESS
something changes
that.
Examples
Golf ball on a tee won’t move
until it gets hit.
The heavier
something is the
harder it is to move;
More force makes
something move
faster.
Force = mass x acceleration
Examples:
A bowling ball takes
more force to push
than a beach ball.
If you apply a force
on something, it acts
back in the opposite
direction and with
the same amount of
force.
The more force used, the more the
object accelerates, the less force
used the less force the object
accelerates.
Action force: air rushes down
Once it is in the air, it won’t stop
until gravity pulls it down and
friction makes it stop.
The heavier the shopping cart, the
more force it takes to move it; the
lighter the shopping cart, the less
force it takes to move it.
Reaction force: balloon goes up
Force = Mass x Acceleration:
1. m = 2 kg; a = 15 m/s2
f = ma
f = 2kg x 15 m/s2
f = 30 N
2. m = 1000kg; a = 9.8 m/s2
f = ma
f = 1000 kg x 9.8 m/s2
f = 9,800 N
3. f = 20 N; m = 10 kg
a = f/m
a = 20 N / 10 kg
a = 2 m/s2
Net Force Practice:
1. In which direction and force will the car move? ____3 N ______
10 N
-7N
3N
2. The dog on the left is pulling with 10 N and the dog on the right
is pulling with 12 N. In which direction and force will the
dogs/rope move? ________________
12 N
2N
- 10 N
2N
3. In which direction and force will the
people/rope move? ________________
320 N
- 300 N
20 N
20 N
4. In which direction and force will the boxes move?
________________
80 N
- 40 N
40 N
40 N
5. The girl is pushing the piano with a force of 25 N. The boy is
pulling the piano with a force of 20 N. In which direction and force
will the piano move? __________________
25 N
+ 20 N
45 N
45 N