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Force

• A force is a push or a pull
• forces acting on the same object that are equal in size but opposite in direction are balanced forces
• forces that are unbalanced are referred to as net forces
• net forces result in a change in motion

Inertia

• Inertia isn't really a force, but the tendency of an object to resist changes in motion
• It is a property due to the object's mass
• The more mass, the more inertia

• the force that opposes motion between any two surfaces that are touching each other
• the amount of friction depends upon
  • amount of force pressing the two surfaces together
  • the texture of the touching surfaces
  • it does not depend upon the amount of surface area

• gravity is a force of attraction that exists between any objects that have mass
• It depends upon
  • mass of the two objects
  • distance between the two objects
• The measure of the force of gravity on an object is its weight

• centripetal forces are forces that cause objects to travel in a curved path
• this force is directed toward the center of the circle
• the acceleration that results is called centripetal acceleration

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