# Have you ever stopped to look at a car accident? - PowerPoint PPT Presentation

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## Have you ever stopped to look at a car accident?

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### Have you ever stopped to look at a car accident? When you look at a car accident you are looking at the results of the Forces of Motion around us. – PowerPoint PPT presentation

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Title: Have you ever stopped to look at a car accident?

1
Have you ever stopped to look at a car accident?
2
When you look at a car accident you are looking
at the results of the Forces of Motion around
us.
Newtons Laws of Motion
3
First we need to define the word FORCE
REVIEW
• The cause of motion (what causes objects to move)
• Two types of forces
• Pushes
• Pulls

4
Forces are measured in Newtons
REVIEW
• SI unit of force
• Symbol N
• Measured by using a spring scale

5
Forces may be balanced or unbalanced
REVIEW
• Balanced forces all forces acting on an object
are equal
• There is NO MOTION
• Unbalanced forces one or more forces acting on
an object are stronger than others
• There is MOTION
• A NET FORCE

6
Newtons Laws
• First Law Inertia
• Second Law Acceleration, Force Mass
• Third Law Action-Reaction

7
• Law 1
• Every object at rest remains at rest and every
object in motion continues moving in a straight
line at a steady rate unless a force acts it on.
• This is the principle of inertia.

Can you tell me how this principle applies to car
accidents?
8
First Law
• Inertia Mass
• Mass is the amount of matter in an object.
• The more MASS an object has, the more INERTIA the
object has.
• Bigger objects are harder to start stop.

http//toons.artie.com
9
Law 2 The amount of force needed to change the
speed of an object depends on the mass of the
object and the amount of acceleration (or
deceleration) needed. This is the principle of
accelerated motion.
Can you tell me how this law applies to car
accidents?
10
Second Law
• Acceleration Force
• The more force placed on an object, the more it
will accelerate change its motion.
• Acceleration Mass
• The more mass or inertia an object has, the
more force it takes to accelerate the object.

11
Second Law
• Force Mass x Acceleration
• Example A 25 g object with an acceleration of 4
m/s2 will have a force of ______ Newtons.

12
Law 3 For every action there is an equal and
opposite reaction. When an object is pushed or
pulled by a force in one direction, another force
pushes or pulls on it with equal strength from
the opposite direction. Forces come in pairs,
called action-reaction pairs.
How does this law apply to car accidents?
13
Third Law
• Action Reaction
• Forces are always produced in pairs with opposite
directions equal strengths.
• For every force there is an equal and opposite
force.

14
Third Law
• Action Reaction
• Action Reaction Forces act on different
objects
• When you kick a soccer ball, you exert a force on
the ball and the ball exerts a force on you. The
harder you kick the bigger the force on you
(kicking REALLY hard might hurt.)

15
Third Law
16
Which Law?
• A swimmer pushes water back with her arms, but
her body moves forward.

17
Newton's third Law Action-Reaction
18
Which Law?
A frog leaping upward off his lily pad is pulled
downward by gravity and lands on another lily pad
instead of continuing on in a straight line.
19
Newton's first Law Principle of Inertia
20
Which Law?
• After you start up your motorcycle, as you give
it more gas, it goes faster.

21
Newton's second Law Accelerated Motion
22
Which Law?
A pitched baseball goes faster than one that is
gently thrown.
23
Newton's second Law Accelerated Motion
24
Which Law?
When you paddle a canoe, the canoe goes forward.
25
Newton's third Law Action-Reaction
26
Which Law?
As an ice skater pushes harder with his leg
muscles, he begins to move faster.
27
Newton's second Law Accelerated Motion
28
Which Law?
A little girl who has been pulling a sled behind
her in the snow is crying because When she
stopped to tie her hat on, the sled kept moving
and hit her in the back of her legs.
29
Newton's first Law Principle of Inertia
30