| A | B |
|---|
| physical quantity with both magnitude and direction | vector |
| change in position of an object | displacement |
| displacement divided by time | velocity |
| quantity with magnitude only | scalar |
| SI base unit of length | meter |
| SI base unit of mass | kilogram |
| the length of the path travelled by an object | distance |
| distance divided by time | speed |
| rate of change in velocity | acceleration |
| slope of a p-t graph | velocity |
| slope of a v-t graph | acceleration |
| four points of a compass | north, south, east, west |
| magnitude of a vector | a number and a unit |
| coordinate system for specifying the precise location of objects in space and time | frame of reference |
| motion in a straight line | one dimensional (1D) motion |
| the 3 forms of acceleration | speeding up, slowing down, or changing direction |
| the motion of an object when only gravity is acting on it | free fall |
| Earth's free-fall acceleration | -9.81 m/s^2 |
| direction of free-fall acceleration | negative direction; down; toward the center of the Earth |
| SI unit of acceleration | m/s^2 |
| the acceleration of an object moving with constant velocity | a = 0 |
| from Chapter 2, three examples of vectors | displacement, velocity, acceleration |
| from Chapter 2, three examples of scalars | distance, time, speed |
| SI unit of speed and of velocity | m/s |
| SI unit of displacement | meter |
| SI base unit of time | second |
| symbol/abbreviation for second | s |
| symbol/abbreviation for both speed and velocity | v |
| region of zero density | vacuum |
