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5 Written questions

5 Multiple choice questions

  1. Friction always occurs between systems in what?
  2. The magnitude (amount) of friction is proportional (increases / decreases as the other increases / decreases) to the what acting on the system?
  3. List and explain the four types of friction.
  4. The friction vector acts in what direction with respect to the system's motion?
  5. There is greater friction between two stationary (still) objects than when they are what?

5 True/False questions

  1. Newton, GalileoWhat property of matter makes it want to continue to move indefinitely unless acted upon by an outside force?

          

  2. Perpendicular to the surfaceIn what direction is the "normal" force on a system?

          

  3. Objects at rest tend to remain at rest and objects in motion tend to remain in motion unless acted upon by a forceNewton's third law is the law of action-reaction, what does this law state?

          

  4. The acceleration of a system is directly proportional to the force and inversely proportional to the mass, F = maNewton's third law is the law of action-reaction, what does this law state?

          

  5. FrictionWhat is a contact force that opposes the movement of objects past each other?