Force and Motion

Chapter 1, Section 1 Vocabulary

  1. Motion:  An object's change in position relative to a reference point.
  2. Speed:  The distance traveled divided by the time interval during which the motion occurred.
  3. Velocity:  The speed of an object in a particular direction.
  4. Acceleration:  The rate at which velocity changes over time; an ojbect accelerates if its speed, direction, or both change.

Chapter 1, Section 2 Vocabulary

  1. Force: A push or pull exerted on an object in order to change the motion of the object; force has size and direction.
  2. Newton: The SI unit for force (Symbol, N)
  3. Net Force:  The combination of all of the forces acting on an object.

Chapter 1, Section 3 Vocabulary

  1. Friction: A force that opposes motion between two surfaces that are in contact.

Chapter 1, Section 4 Vocabulary

  1. Gravity:  A force of attraction between objects that is due to their masses.
  2. Weight:  A measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe.
  3. Mass:  A measure of the amount of matter in an object.