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Conservation of Mechanical Energy

Conservation of Mechanical Energy. Kinetic Energy and Potential Energy. http://www.loqu.com/top-10-most-significant-land-speed-records-of-all-time/blogs/hotday-5390.

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Conservation of Mechanical Energy

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  1. Conservation of Mechanical Energy Kinetic Energy and Potential Energy

  2. http://www.loqu.com/top-10-most-significant-land-speed-records-of-all-time/blogs/hotday-5390http://www.loqu.com/top-10-most-significant-land-speed-records-of-all-time/blogs/hotday-5390 • The land-speed record for a wheel-driven car is nearly 738 km/h. (recorded at the Bonneville Salt Flats on 10/18/01) If the mass of this car was approximately 1.0x103 kg, what was its kinetic energy?

  3. Potential Energy (U) • The amount of energy that is stored in a body • A measure of how much work CAN be done • Gravitational Potential Energy: the amount of work that can be done on a body as a result of its position above a reference point (in Earth’s gravitational field) Ep= mgh Where m = mass (kg) g = acceleration due to gravity (9.81 m·s-2) And h = height (m) above reference level

  4. The Principle of Energy Conservation • The total amount of energy a body possesses will remain constant, although the type of energy may be transformed from one form to another • Note: many times the energy transforms into a “useless” form, so it appears that energy has been lost…when it really hasn’t! • Conservation of Mechanical Energy:

  5. Review questions! • How much energy does a 875 g flower pot have if it is on a shelf 95.0 cm above the ground? • How fast is the flower pot traveling when it is 35.0 cm above the ground?

  6. A car slides down an icy hill that has a height from top to bottom of 14.0 m. What is its speed when it hits the snow bank at the bottom of the hill?

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