Driver's Fabulous Fourth Grade

Smile it's contagious.

4.2 Force, Motion, and Energy

  • the position of an object can be described by locating it relative to another object or to the background
  • speed describes how fast an object is moving
  • energy may exist in two states: kinetic or potential
  • kinetic energy is the energy of motion
  • potential energy is stored energy
  • 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 changes in motion will be.  The more massive an object, the less effect a given force will have on the object.
  • friction is the resestance to motion created by two objects moving against each other.  Friction creates heat.
  • Unless acted on by a force, objects in motion tend to stay in motion and objects at rest remain at rest.