# Changes in Energy and Momentum.pdf - Changes in Energy and...

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1 Changes in Energy and Momentum Name: Learning Objectives: 1. Understanding the relationship between force, distance and changes in kinetic energy. 2. Understanding the relationship between force, time and changes in momentum. 3. Understanding the relationship between force and work. 4. Understanding the relationship between force and impulse. Apparatus: Aluminum track, track legs, smart cart with cart fan, two cart stops, and four 100g masses. Part A: Predictions cart stop smart cart with fan cart stop Before watching the video using the equipment as drawn above, consider the situation shown above (call this case #1). The cart (mass m) starts from rest a distance dfrom the cart stop. The fan is used since it provides a constant forceas the cart moves to the right and collides with the cart stop. Just before the collision the cart is moving with velocity𝑣?. 1.Identify the forces on the cart when the fan is running. Then draw the free body diagram for the cart. Indicate the direction of the net force and acceleration next to the free body diagram.
2 2.Draw your prediction for the velocity vs. time graph for case #1. Case 2 is the higher line. 3.If mass is added to the cart and the experiment is repeated (call this case #2), will the time it takes to travel to the cart stop be shorter, longer, or the same as it will be for case #1 when there was no added mass? Explain your reasoning.