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SOL 4.2 -- Motion Click here for printable version
SOL 4.2 Motion -- Key concepts:
  1. motion is described by an object’s direction and speed;
  2. changes in motion are related to force and mass;
  3. friction is a force that opposes motion; and
  4. moving objects have kinetic energy.

KINETIC AND POTENTIAL ENERGY
  • Energy may exist in two states: kinetic or potential.
  • Kinetic energy is the energy of motion.
FORCES
  • A force is any push or pull that causes an object to move, stop, or change speed or direction.
  • The greater the force, the greater the change in motion will be. The more massive an object, the less effect a given force will have on the object.
  • Unless acted on by a force, objects in motion tend to stay in motion and objects at rest remain at rest.
FRICTION
  • Friction is the resistance to motion created by two objects moving against each other.
  • Friction creates heat.
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