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Force: A push or pull upon an object resulting from the object's…
Force: A push or pull upon an object resulting from the object's interaction between two objects. Forces ONLY exist as a result of an interaction.
Newton's Laws
2nd Law: The force acting on an object is equal to the mass of that object times acceleration, F=m * a
1st Law/Law of Inertia: Moving objects don't spontaneously speed up, slow down, or change direction.
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Contact Forces: Forces that are a result of two interacting objects that are perceived to be in physical contact.
Frictional force, tension force, normal force, air resistant force, applied force, spring force.
Action-at-a-Distance Forces: Forces that are a result of two interacting objects not in physical contact, but are still able to exert a push/pull.
Gravitational force, electrical force, magnetic force.
Free Body Diagrams: Simple diagrams that show the size and direction of all forces acting upon an object.
- Determine all the forces that are acting upon an object.
- Determine the direction of which each force is acting.
Balanced Forces: If the forces in a FBD are balanced, it means that the object has an acceleration of 0 m/s/s and that is has equal amounts of force in every direction. This means that the object is either at rest, or in constant motion (same speed + direction).
Unbalanced Forces: If the forces acting upon an object are NOT balanced, this means that the object is accelerating. This acceleration will depend on the net force of the object, which is also dependent upon the object's mass.
Frictional Forces: parallel to the surface that the object is moving on, it will resist the motion of the object as it moves.
Static Friction: Resists the initiation of motion. Static friction will increase until the applied force exceeds the maximum static frictional force, and the object will start accelerating.
Proportional to the normal force, (heavier the object = greater the normal force = greater the frictional force). This is because the heavier an object is, the more it presses down on the surface and has more points of contact with it.
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Kinetic Friction: Resists the motion of a moving object, always less than static friction.
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Coefficient of friction: Every surface has a different amount of friction depending on its composition. (smoother the surface = less amount of friction)
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