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A backpack is a type of bag that typically has two straps for carrying on one's back. It is designed to evenly distribute the weight of its contents across both shoulders for ease of carriage.
A backpack exerts a downward force on the body due to gravity pulling it downward. Additionally, the straps of the backpack exert a force on the shoulders and back to support the weight of the backpack.
The backpack exerts a downward force due to gravity on the body's back. Additionally, the straps create tension forces that pull the backpack towards the body.
The backpack exerts a downward force (due to gravity) on the body's back and hips. This force is distributed across the back and hips, depending on the weight of the backpack and how it is positioned on the body.
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As the backpack gets higher, the distance over which you are lifting it increases, requiring more work to overcome gravity. The force needed to lift the backpack is directly proportional to the distance it is lifted and the weight of the backpack. This is due to the gravitational force acting on the backpack.