3. Look at the picture above. How far down the incline from the motion sensor is

Question

3. Look at the picture above. How far down the incline from the motion sensor is the zero point of potential energy?

Xuo is 2.2 meters away as measured from sensor toward bottom of track.

The value for Xuo will be set to distance from sensor to closest edge of cart when cart is at rest at bottom of track.

Xuo will be set to distance from sensor to farthest edge of cart when cart is at rest at bottom of track.

Xuo is 2 meters away as measured from sensor toward bottom of track.

there is no difference

mgsin

friction

twice friction

H/L

U mgh mg How do I find h for use in Potential Energy equation? The motion sensor cannot measure h directly. We know that with Potential Energy, we need to set a refer ence point for where potential energy is zero, that is where h is also zero. Let's make that point the bottom of the track; or rather, the closest edge of cart to the sensor when the cart is at rest at the bottom of the track. Let's call h 0 there; and let's say the position x measured by sensor is Xuo Xuo h -(xuo-x sin 0 (xuo-x)

Explanation / Answer

In the question 1, we can take the bottom of the incline as zero potential energy point. Actually potential energy is a relative quantity.You can trake any point as reference point, and measure other point's potential energy with respect to that point. Rest is already shown in the given figure.

For question 13 ,the only difference in force up the incline vs force down the incline is the direction of friction force. When moving up the incline, the direction of friction force is downward while moving down the incline the direction of friction force is upward. Rest all other forces remains the same as downward and upward.

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