| A | B |
|---|
| Force | A push or a pull on an object. There are 2 categories of forces; contact and non-contact. |
| Contact Force | When 2 objects touch one another there are forces that act between them. There are 3 contact forces you should know; Friction (includes air resistance), Applied Force, and Normal Force. |
| Noncontact Force | A force that an object applies to another object without touching it. There are 3 non-contact forces you should know; Gravity, Electrical, and Magnetic. |
| Gravity | An attractive force that exists between all objects that have mass. The more mass and the closer the objects the greater the gravitational attraction. |
| Friction | A contact force that resists the sliding motion of two surfaces that are touching. It's an opposing force. |
| Air Resistance | The frictional force between the air molecules and an object as the object moves through it. |
| Newton's 1st Law of Motion | Law that states that if the net force acting on an object is zero, the motion of the object does not change (things at rest stay at rest things in motion stay in motion). |
| Newton's 2nd Law of Motion | Law that states that the acceleration of an object is equal to the net force exerted on the object divided by the object's mass. (F/M=a) |
| Newton's 3rd Law of Motion | Law that states that for every action there is an equal and opposite reaction. |
| Electrical Force | A force that one charge exerts on another. When the charges are the same sign, they repel; when the charges are opposite, they attract. |
| Magnetic Force | A physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects. This usually involves a north and south pole. |
| Applied Force | Push or a pull. |
| normal force | the support force exerted upon an object that is in contact with another stable object |
| Electrons | Negatively charged particles of an atom used for electricity |
| repel | when two magnets of the same polarity push away |
