FORCES!

• An object always accelerates in the "blank" of an unbalanced force?

  direction
• How many Newton's laws of Motion are there?


  Three
• Newtons first law (inertia) states that if an object has balanced forces it can be at rest or constant velocity
• Inertia is an object tendency to resist change in its motion
• Newtons second law states that an when an unbalanced force acts on an object, that object will accelerate in the direction of the unbalanced force
• Friction always opposes motion
• Kinetic friction is the force of friction while an object is moving
• Static friction is the force of friction that must be overcome to initiate motion
• What is the max μ value you can have?

  1
• What does the force of friction depend upon?

  coefficient of friction or material of the surface and the normal force between them
• Newtons third law states that for every action there is an equal and opposite reaction force
• Example of Newtons third law: Push into to wall, and the wall pushes back onto you causing your motion to move back and away from the wall
• What is the net force of an object when it is at rest?


  0
• Contact forces are forces that act between two objects that are in contact with each other.
• Distance forces are the forces that act between two objects that are separated by a distance.
• Gravitational field strength unit is?


  N/kg
• Gravitational field strength changes depending on planet and altitude (Farther from Earths center)
• Mass is the amount of matter withing an object
• Weight is the force of gravity acting upon an object
• Force of gravity never equals zero!