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Page 1

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Newton
It was known that force causes
motion. Newton clarified this
by showing that in certain
situations, force can cause
acceleration.

Page 2

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What is Force?
Force: That which changes or
attempts to change the velocity or
shape of an object. (The
shape-changing abilities of forces
are covered in the later topic of
Elasticity)

Page 3

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Force words
In mechanics, Forces may also
be labelled: Effort, Load,
Thrust, Drag, Friction,
Reaction, Tension,
Compression, Weight, and
Centripetal.

Page 4

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Three Laws
Newton devised three laws of
motion ­ the basis of
Newtonian Mechanics.

Page 5

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First Law
Every object continues in a
state of rest OR uniform
velocity in a straight line unless
acted upon by an unopposed
(i.e. resultant) force.

Page 6

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Implication
If you kick a ball and no other
force acts on it (no friction, no
weight ­ i.e. assume there is no
gravity) then it will travel in a
straight line at the speed you
kicked it for ever.

Page 7

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Implication
Remember that equal and
opposite forces do not just act
on objects at rest. They could be
acting on objects moving at
constant velocity (e.g. when
Thrust = Drag)

Page 8

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Second Law
The rate of change of
momentum of an object is
directly proportional to the
applied force and occurs in the
direction of the force. This can
be expressed mathematically
as...

Page 9

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Second Law
F
p t
Where p is the momentum,
calculated from (mass x
velocity).

Page 10

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Second Law
F =
p t
Is only true if we define a force
of 1 Newton = 1kgms-2.

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Pages in this set

Page 1

Preview of page 1
Newton
It was known that force causes
motion. Newton clarified this
by showing that in certain
situations, force can cause
acceleration.

Page 2

Preview of page 2
What is Force?
Force: That which changes or
attempts to change the velocity or
shape of an object. (The
shape-changing abilities of forces
are covered in the later topic of
Elasticity)

Page 3

Preview of page 3
Force words
In mechanics, Forces may also
be labelled: Effort, Load,
Thrust, Drag, Friction,
Reaction, Tension,
Compression, Weight, and
Centripetal.

Page 4

Preview of page 4
Three Laws
Newton devised three laws of
motion ­ the basis of
Newtonian Mechanics.

Page 5

Preview of page 5
First Law
Every object continues in a
state of rest OR uniform
velocity in a straight line unless
acted upon by an unopposed
(i.e. resultant) force.

Page 6

Preview of page 6
Implication
If you kick a ball and no other
force acts on it (no friction, no
weight ­ i.e. assume there is no
gravity) then it will travel in a
straight line at the speed you
kicked it for ever.

Page 7

Preview of page 7
Implication
Remember that equal and
opposite forces do not just act
on objects at rest. They could be
acting on objects moving at
constant velocity (e.g. when
Thrust = Drag)

Page 8

Preview of page 8
Second Law
The rate of change of
momentum of an object is
directly proportional to the
applied force and occurs in the
direction of the force. This can
be expressed mathematically
as...

Page 9

Preview of page 9
Second Law
F
p t
Where p is the momentum,
calculated from (mass x
velocity).

Page 10

Preview of page 10
Second Law
F =
p t
Is only true if we define a force
of 1 Newton = 1kgms-2.

Comments

No comments have yet been made