Chapter 12: Matter in Motion. Reference Point An object that appears to stay in place that helps detect motion.

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Presentation transcript:

Chapter 12: Matter in Motion

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

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

Velocity Speed plus direction

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

Measuring Acceleration

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

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

Friction Force that opposes motion Depends on the materials

Kinetic Friction “Moving” Sliding Kinetic Friction Rolling Kinetic Friction

Friction Helpful – Brakes – Pencil marks – Match

Friction Harmful

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