# Science Chapter 1 Test

## Terms

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- Motion
- The state in which one object's distance from another is changing.
- Acceleration
- The rate at which velocity changes.
- International system of units (SI)
- A system of measurement based on multiples of ten and on established measures of mass, length, and time; used by scientists to measure the properties of matter.
- Linear
- A relationship whose graph is a line with a constant slope.
- Meter
- The basic SI unit of length.
- Nonlinear
- A relationship whose graph is a curved line.
- Plate
- One of the major pieces that that make up Earth's upper layer.
- Reference point
- A place or object used for comparison to determine if an object is in motion.
- Slope
- The steepness, or slant, of a line on a graph.
- Speed
- The distance an object travels in one unit of time.
- Velocity
- Speed in a given direction.