Discussion 4

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Energy and Momentum

1. An IOLab device is pushed with a constant force on a horizontal, frictionless surface which results in it moving to the right. With what type of motion does the IOLab device move? (Constant speed, increasing speed, decreasing speed) How do you know?

2. In Figure 1, two IOLab devices are placed at point A on a horizontal, frictionless surface (as viewed from above). An IOLab device has a mass of 0.2 kg. Device 2 has extra mass placed on it such that its total mass is 0.7 kg. Both devices are initially at rest when a constant force of  is applied to the right to each. Which IOLab device reaches point B first? Why?
3. How does the change in momentum of device 1 compare to the change in momentum of device 2?
4. How does the impulse of device 1 compare to the impulse of device 2?
5. How does the net work done on device 1 compare to the net work done on device 2?
6. How does the kinetic energy for device 1 compare to the kinetic energy of device 2 at point B?

7. In Figure 2, an IOLab device is launched up a frictionless inclined plane. What forces act on the device after it has been launched?
8. Which forces do work on the device? Which forces do zero work on the device?

9. In Figure 3, the IOLab device is now launched with the same speed up a steeper incline. Note that the height of the incline is still the same as in Figure 2. How does the magnitude of the net work done on the device compare to the net work done on the device in Figure 2?

10. In Figure 4, the IOLab device is launched with the same speed but follows a curved path instead. How does the magnitude of the net work done on the device compare to the net work done on the device in Figures 2 and 3?
11. Compare the final speeds of the IOLab device in Figures 2, 3, and 4.