| A | B |
|---|
| scalar | quantity only has SIZE |
| vector | quantity has SIZE and DIRECTION |
| unbalanced force | forces do NOT add up to zero |
| net force | result of adding up all the forces |
| resultant force | same as net force |
| mass | amount of matter (kg) |
| weight | force of gravity (N) |
| action | any force acting on an object |
| reaction | force responding to an action |
| terminal speed (or velocity) | maximum speed against fluid resistance |
| displacement | change in position (vector) |
| distance | distance covered (scalar) |
| average speed | distance/time (scalar) |
| average velocity | displacement/time (vector) |
| average acceleration | change in velocity/time (vector) |
| force | push or pull (vector) |
| 247(degrees) T | 247 degrees clockwise from N |
| normal reaction | perpendicular force from a surface |
| sliding (kinetic) friction | friction force between two sliding surfaces |
| static friction | friction force between two non-sliding surfaces |
| rolling friction | force on wheels that opposes rolling; always opposes motion |
| fluid (air or liquid) resistance | force which resists motion through the fluid |
| equilibrium | state where all forces are balanced (a = 0) |
| inclined plane | flat sloping surface |
