| A | B |
|---|
| acceleration | a change in the velocity's rate |
| positive acceleration | when the speed increases |
| negative acceleration | when the speed decreases |
| acceleration | when the speed is constant but direction changes |
| Vf - Vi / t | equation for acceleration |
| Vf - Vi | equation for change in velocity |
| 0 | Vi if object is at rest |
| 0 | Vf if object stops |
| M/s/s | Units for acceleration |
| positive acceleration | when the slope is positive on a velocity time graph |
| negative acceleration | when the slope is negative on a velocity time graph |
| free fall | Acceleration due to gravity only |
| 9.8 m/s/s | Gravity here on earth |
| fluid friction | force that opposes the motion of objects through air |
| Terminal velocity | The constant velocity of a falling object when the amount of upward force of air resistance equals the amount of downward force (gravity) |
| reference point | a place or object that can be used to determine if an object is in motion |
| distance/time | equation for speed |
| Velocity has direction | The difference between speed and velocity |
| Force | A push or pull on an object |
| static friction | Force holding an object in place |
| sliding friction | In order to continue to drag a table across a floor you would have to overcome this |
| rolling friction | In order to continue to move a stalled car you would have to overcome this |
| static is stronger than rolling or sliding | Why is it easier to move something, once you get it going? |
| friction | a force that opposes motion between two surfaces that are touching |
| gravity | a force of attraction between objects due to their mass difference |
| inertia | the tendency of all objects to resist any change in motion |
| weight | a measure of the gravitational force exerted on an object, usually by the earth |
| mass | The amount of matter in an object |
| mass | The amount of inertia an object possesses |
| distance | the length of a path between two points |
| displacement | the distance and direction from the starting point |
| relative motion | movement in relation to a frame of reference |
| vector | quantity that has magnitude and direction |
| vector addition | way of combining vector magnitudes and directions |
| resultant vector | vector sum of two or more vectors |
| speed | The ratio of distance to time |
| average speed | The total distance divided by the total time as opposed to instataneous |
| constant speed | A straight flat line on a distance time graph represents |
| acceleration | The slope of speed-time graph |
| accelerated motion | Represented by a curved line on a distance time graph |
| Newton | SI unit of force |
| net force | The overall force acting on an object after all forces are combined. |
| balanced forces | Concerning forces, what does it mean when there is no motion |
| unbalanced force | Concerning forces, what does it mean when there is motion? |
| inertia | the tendency of an object to resist a change in motion |
| newton's first law | Sometimes called the law of inertia |
| Newton's first law | States that the motion of an object does not change as long as the net force acting on an object is zero. |
| Newton's second law | The acceleration of an object is equal to the net force acting on it divided by the object's mass |
| Newton's second law | Represented by F = ma |
| Newton's third law | For every action there is an equal and opposite reaction. |
| No | Do all action reaction forces cause motion? |
| Momentum | Product of an object's mass and its velocity |
| Momentum | Represented by F = mv |
| Electromagnetic force | associated with charged particles |
| Electric and magnetic | Only forces to attract and repel |
| attract | According to the electromagnetic forces opposites charges |
| repel | According to the electromagnetic forces like charges |
| strong nuclear force | Force of attraction that keeps the protons and neutrons together in the nucleus |
| weak nuclear force | Force of attraction that allows nuclear decay to happen |
| gravitational force | This force is very weak but acts over very large distances |
| vector addition | Two or more velocities add by |
