types of forces force – an interaction between two objects resulting in a push or a pull
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Types of Forces
Force – An interaction between two objects resulting in a push or a pull
Types of ForcesExample 1
Consider the water bottle below at rest on a table.
System Schema – a visual representation of the objects that are interacting and the types of interactions (Forces) that are occurring.
Water Bottle
EarthgF
gF
Force of Gravtity = A long range force exerted by the Earth on an object
Types of ForcesExample 1
Consider the water bottle below at rest on a table.
Water Bottle
Earth
Table
gF
NF
gF
NF
Floor
NF
Normal Force = A support force that always acts perpendicular (Normal) to the surface
Types of ForcesExample 1
Consider the water bottle below at rest on a table.
Water Bottle
Earth
Table
gF
NF
The water bottle has two interactions leading to two forces acting upon it.
Example 2
Consider the water bottle below pulled horizontally across the floor
at constant velocity.
Types of Forces
Types of Forces
Water Bottle
EarthgF
FloorNF
involved. surfaces
the to parallel acts Alwaysanother. over surface one
of motion attempted or motion the opposes that Force Friction of Force fF
fF
Example 2
Consider the water bottle below pulled horizontally across the floor
at constant velocity.
Types of Forces
Water Bottle
EarthgF
FloorNF
fF
Types of friction:
fkF
Force of Kinetic Friction = force of friction due to surfaces in relative motion
fsF
Force of Static Friction = force of friction that opposes attempted motion of the surfaces
fkF
Example 2
Consider the water bottle below pulled horizontally across the floor
at constant velocity.
Types of Forces
Water Bottle
EarthgF
FloorNF
fkF
AF
Me
Example 2
Consider the water bottle below pulled horizontally across the floor
at constant velocity.
AF
Applied Force = the force which is applied to an object by a person or another object.
Types of Forces
Water Bottle
EarthgF
FloorNF
fkF
Example 2
Consider the water bottle below pulled horizontally across the floor
at constant velocity.
The water bottle has four interactions leading to four forces acting upon it. AF
Me
Example 2a
What would change about the system schema if the bottle was pulled across the
floor at constant velocity by a rope?
Types of Forces
Types of Forces
Force of Tension = force which is transmitted through a string, rope, wire or cable when it is pulled tight by forces acting from each end.
TF
TF
Water Bottle
EarthgF
FloorNF
fkF
Rope
Example 2a
What would change about the system schema if the bottle was pulled across the
floor at constant velocity by a rope?
Types of Forces
TF
Water Bottle
EarthgF
FloorNF
fkF
Rope
Example 2a
What would change about the system schema if the bottle was pulled across the
floor at constant velocity by a rope?
Me AF
The water bottle has four interactions leading to four forces acting upon it.
I interact with the rope, not the water bottle.
Types of Forces
TF
Water Bottle
EarthgF
FloorNF
fkF
Rope
Example 2a
What would change about the system schema if the bottle was pulled across the
floor at constant velocity by a rope?
The water bottle has four interactions leading to four forces acting upon it.