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**Chapter 9: Motion and Forces**

Section 1: Describing Motion Motion Reference point Distance Displacement Vector Section 2: Speed and Velocity Speed Average speed Instantaneous speed Velocity Slope

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**Chapter 9: Motion and Forces**

Section 3: Acceleration Section 4: Energy Work Kinetic energy Potential energy Gravitational potential energy Elastic potential energy Mechanical energy Law of conservation of energy

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Describing Motion Motion happens when the distance from one object to another changes.

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Describing Motion A Reference Point is a place or object used for comparison to determine if something is moving Motion is different for different reference points The choice of reference point determines an object’s relative motion.

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Describing Motion Displacement is the length and direction that an object has moved from its starting point. Distance is the total length of the path between two points. Displacement is a vector, which is a quantity that has both magnitude (size) and direction.

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**Examples of Relative Motion**

#1 Train is moving 100kph relative to the tree/earth Passenger is running 15kph towards the back of the train. How fast is the runner moving toward the tree? Direction of passenger Tree Direction of Train

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**Examples of Relative Motion**

#2 Train is moving 100kph relative to the tree/earth Passenger is running 20kph towards the front of the train. How fast is the runner moving toward the tree? Direction of passenger Tree Direction of Train

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**Examples of Relative Motion**

#3 Train is moving 10kph relative to the tree/earth Passenger is running 20kph towards the front of the train. How fast is the runner moving from the tree? Direction of passenger Tree Direction of Train

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**Examples of Relative Motion**

#4 Train is moving 10kph relative to the tree/earth Passenger is running 10kph towards the back of the train. How fast is the runner moving toward the tree? Direction of passenger Tree Direction of Train

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