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Objective: To identify whether positive, negative, or zero work is being done, to identify the force that is doing the work, and to describe the energy transformation associated with such work.

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Moving Cart on an Inclined Plane

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Analyze a single graph to determine a value of time, position, or speed.

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Interpret the graphs to support a claim regarding the up and down motion of the cart on an inclined plane.

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Analyze both graphs to determine a value of position or speed.

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Motion Along an Inclined Plane A group of physics students studying the motion of a cart along an inclined plane perform the following procedure. They place a few bricks under one end of a metal track to create an inclined plane. They give a cart a push from the bottom of the track. The cart rolls up the incline to its highest point and then rolls back down. The students stop the cart at the bottom of the track. A motion detector is used to measure the position and the velocity of the cart as a function of time. The position is the distance measured from the starting point (zero position) to the cart. The velocity refers to how fast the cart is moving (i.e., the speed) and the direction the cart is moving. The cart's direction is represented by a + or - sign. A cart moving up the inclined plane is moving in the positive direction and is said to have a + velocity. A cart moving down the inclined plane has a - velocity. The results of the study are shown in Figure 1.

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Physics-Interactives/Static-Electricity/

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