1. Chapter 12: Matter in Motion

2. Reference Point An object that appears to stay in place that helps detect motion

3. Speed Total distance / total time – mph – m/s

4. Velocity Speed plus direction

5. Acceleration Rate of which velocity changes – m/s² – Positive or negative

6. Measuring Acceleration

7. Force a Push or Pull Measured in – Newtons Net Force = – Combined of forces acting on an object

8. Unbalanced Forces When the net force is greater than 0 Newton Unbalanced force can: – Start motion – Change motion – Stop motion

9. Friction Force that opposes motion Depends on the materials

10. Kinetic Friction “Moving” Sliding Kinetic Friction Rolling Kinetic Friction

11. Friction Helpful – Brakes – Pencil marks – Match

12. Friction Harmful

13. Terms to Know Friction Force Motion Acceleration Net force Kinetic friction Velocity