| Question | Answer |
| Force | something that can change the motion of an object. |
| Contact force | a force that directly touches an object. |
| Non-contact force | a force that is not touching an object; has a field that weakens with distance. |
| Types of contact forces | friction, applied, normal |
| Types of non-contact forces | gravity, magnetism, electricity |
| Friction | an opposing force that resists motion. |
| Applied force | a push or a pull force. |
| Normal force | a force perpendicular to the point of contact. |
| Gravity | force of attraction between two masses. |
| Magnetism | force of attraction between two charged particles. |
| Electrical force | movement of electrons that creates a magnetic field around a conductor. |
| Items to describe a normal force | perpendicular to a surface; only works in contact to a surface. |
| Items to describe frictional force | parallel to the surface; only works in contact to a surface; opposes motion; must work in gravity. |
| Items to describe an applied force | a push or a pull; works parallel to the surface; can work without gravity; |
| Items to describe gravitational force | increases with more mass; decreases with distance; happens between any two pieces of matter; has a field; spreads out equally in all directions. |
| Items to describe magnetic force | increases with mass; decreases with distance; stronger at the poles; weaker along the sides; typically metals. |
| Items to describe an electrical force | increases with mass; decreases with distance; stronger at the poles; weaker along the sides; can turn metals into a magnet; jumping electrons. |
