Unit: 1D Kinematics

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When an object undergoes multiple movements in sequence, we find its total displacement by adding the individual displacements together.

For horizontal motion with displacements Δx1\Delta x_1, Δx2\Delta x_2, Δx3\Delta x_3, etc., the total displacement is:

Δxtotal=Δx1+Δx2+Δx3+\Delta x_{total} = \Delta x_1 + \Delta x_2 + \Delta x_3 + \cdots

Positive values represent rightward movement and negative values represent leftward movement. For example, if an object moves right by Δx1=5 m\Delta x_1 = 5 \text{ m} , left by Δx2=3 m\Delta x_2 = -3 \text{ m} , then right by Δx3=2 m\Delta x_3 = 2 \text{ m} :

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The total displacement is:

Δxtotal=5+(3)+2=4 m\Delta x_{total} = 5 + (-3) + 2 = 4 \text{ m}

For vertical motion with displacements Δy1\Delta y_1, Δy2\Delta y_2, Δy3\Delta y_3, etc.:

Δytotal=Δy1+Δy2+Δy3+\Delta y_{total} = \Delta y_1 + \Delta y_2 + \Delta y_3 + \cdots

Positive values represent upward movement and negative values represent downward movement. If an object moves up by Δy1=8 m\Delta y_1 = 8 \text{ m} , down by Δy2=5 m\Delta y_2 = -5 \text{ m} , down by Δy3=2 m\Delta y_3 = -2 \text{ m} , then up by Δy4=3 m\Delta y_4 = 3 \text{ m} :

... continued in the full lesson.

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