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Gravity & Friction Lesson - Coggle Diagram
Gravity & Friction Lesson
Force
Non-contact Forces
Gravity
Attractive force that exists between all objects that have mass
Gravitational force increases if mass of (at least) one object increases
The farther away 2 objects are from one another, the smaller the gravitational pull between both objects are
The closer 2 objects are from one another, the larger the gravitational pull between both objects are
Weight & Mass
Weight is the gravitational force exerted on an object
An object's weight is proportional to its mass
On Earth, objects' weight (in Newtons) is roughly 10 times its mass (in Kilograms)
Mass is the quantity of matter which an object contains in any environment (space, planets, etc)
A force that one object can apply to another object without any physical contact
Example: Magnetic force that attracts/repels certain magnetic items.
A push/pull on an object
Contact Forces
A push/pull on one object by another that's making contact with it
Example: Movements of large underground rocks; i.e. Earthquake
Strength & direction is important
Different actions occur when direction is different but strength is the same, and vise versa
SI unit of force is the Newton (N)
Friction
A force that resists the motion of 2 surfaces that are physically touching
Static Friction
Static Friction prevents surfaces from sliding past each other
If more force is applied to push an item, it won't move since Static Friction also increases
Sliding Friction
Static Friction will have a limit and eventually causes the item to move. When item is sliding at a constant, Sliding Friction will remain the same, but when pushing increases or stops, Sliding Friction will cause item to slide faster or stop
Fluid Friction
Fluid Friction is friction between a surface and a fluid
Decreasing surface area toward oncoming fluid decreases air resistance against object
Lubricants/liquids reduce friction by making surfaces slippery
Sir Isaac Newton
Newton's 3 Laws of Motion
Newton's 1st Law:
An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an unbalanced force
Newton's 2nd Law:
Acceleration of an object is dependent upon mass of that object and net force acting upon that object.
F = ma
(Force = mass x acceleration)
Newton's 3rd Law:
Every action has its equal, opposite reaction.