Forces & Newton’s laws of motion - Old Dominion University
forces & Newton¡¯s laws of motion
physics 111N
forces (examples)
a push is a force
a pull is a force
gravity exerts a force
between all massive objects
(the force of attraction
(without contact)
from the Earth is called
the weight force)
physics 111N
2
contact forces
a normal force occurs
when an object pushes
on a surface
the force is perpendicular
to the surface
a friction force can
occur parallel to the
surface of contact
physics 111N
3
force vectors
forces have magnitude
(measured in Newtons, N)
and direction
e.g.
physics 111N
4
pulling a fridge - resultant force
two guys are moving a fridge by pulling on ropes attached to it
Steve is very strong, Walter is much weaker
physics 111N
5
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