Forces & Newton’s laws of motion
forces & Newton's laws of motion
physics 111N
forces (examples)
a push is a force a pull is a force
physics 111N
gravity exerts a force
between all massive objects
(without contact)
(the force of attraction
from the Earth is called
the weight force)
2
contact forces
physics 111N
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
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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