types of forces force – an interaction between two objects resulting in a push or a pull

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.