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Topic 1 - Motion, Forces & Conservation of Energy
Contact & Non-Contact Forces
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Force
A
push
or
pull
that
acts
on an object due to its
interaction
with
another
object
Newtons
The
unit
used to measure
force
Forces
Have both
magnitude
(measured in
newtons
) and
direction
Vector
quantities
Quantities that have both
magnitude
and
direction
Types of forces
Contact
forces
Non-contact
forces
Contact
forces
Require the two objects to be
physically
touching
Normal contact force
Also known as the reaction force, it is the
equal
and
opposite
force
exerted
by a
surface
to keep an object in
position
Non-contact
forces
Do not require the two objects to be
touching
Types of non-contact forces
Gravitational
force
Magnetic
force
Electrostatic
force
Fields
of
influence
The
surrounding
area
where
non-contact
forces can
act
on
objects
As the
distance
between objects
increases
The
strength
of
non-contact
forces
decreases