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**Conceptual Physics by Hewitt C H A P T E R 2- Linear Motion**

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Mechanics The study of Physics begins with mechanics.

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**Mechanics The study of Physics begins with mechanics.**

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change.

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**Mechanics The study of Physics begins with mechanics.**

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change. There are two parts to mechanics: Kinematics and Dynamics.

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**Mechanics The study of Physics begins with mechanics.**

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change. There are two parts to mechanics: Kinematics and Dynamics. Kinematics deals with the concepts that are needed to describe motion, without any reference to forces. Chapter 2:Linear Motion-- Kinematics in one dimension Chapter 3:Projectile Motion-- Kinematics in two dimensions

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**Mechanics The study of Physics begins with mechanics.**

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change. There are two parts to mechanics: Kinematics and Dynamics. Kinematics deals with the concepts that are needed to describe motion, without any reference to forces. Chapter 2: Kinematics in one dimension Chapter 3: Kinematics in two dimensions Dynamics deals with the effect that forces have on motion. Chapter 5 primarily

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**Position vs Distance vs Displacement**

Position is the location of an object at any given time along a chosen path with a chosen position selected as 0. At time 0, an object may be at any position along the chosen path. In a race between a child and a parent, the parent may give the child a head start, say at position 5 meters, whereas the parent starts at position 0 meters on the race path.

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**Position vs Distance vs Displacement**

Distance is most correctly interpreted to mean the total length travelled. If school is 3 miles from your home, the total distance you travel in a day is 6 miles (assuming you only are at school or home).

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**Position vs Distance vs Displacement**

Displacement is simply the final position minus the initial position which is often represented by the equation: D = xf-xi So as in the previous slide, if school is 3 miles from your home, the total displacement for you that day is 0 miles since you end up where you started.

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**Distance and Displacement**

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**Distance and Displacement**

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west.

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**Distance and Displacement**

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west. Q: What is the total walked distance?

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**Distance and Displacement**

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west. Q: What is the total walked distance? A: 130-m

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**Distance and Displacement**

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west. Q: What is the total walked distance? A: 130-m Q: What is the displacement?

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**Distance and Displacement**

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west. Q: What is the total walked distance? A: 130-m Q: What is the displacement? A: 50-m, due east.

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Displacement The displacement Δx is a vector that points from the initial position to the final position. SI Unit of Displacement: meter (m)

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**Final Note and Additional Resource**

Distance is a scalar quantity (only magnitude). Displacement is a vector quantity (magnitude and direction).

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