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## Calculate the ratio of the mechanical energy at B and mechanical energy at A (EB/EA) and (EC/EB). What do these ratios tell you about the conservation of energy? ……………………………………………………………………………………………… ……………………………………………………………………………………………… ii- Is the mechanical energy conserved between A and B? Explain ……………………………………………………………………………………………… iii- Is the mechanical energy conserved between B and C? Explain

 mass of skater: m = 50 kg,                                                       g = 9.80 m/s2 Point Height (y) (m) Speed (v) (m/s) Potential Energy (Ug) (J) Kinetic Energy (K) (J) Mechanical Energy (E) (J) A 6 0 2940 0 2940 B 2 9 980 2025 3005 C 0 11 0 3025 3025

i- Calculate the ratio of the mechanical energy at B and mechanical energy at A (EB/EA) and (EC/EB). What do these ratios tell you about the conservation of energy?

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ii– Is the mechanical energy conserved between A and B? Explain

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iii– Is the mechanical energy conserved between B and C? Explain

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Questions:

1- Define the energy and name three of its forms.

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2- What is the difference between conservative and non-conservative force? Give an example of each force.

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3- Write down the principle of conservation of mechanical energy.

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4– A single frictionless roller-coaster car of mass m = 750 kg tops the first hill with speed v= 15 m/s at height h = 40 m as shown

i– Find the speed of the car at B and C

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ii- If mass m were doubled, would the speed at B increase, decrease, or remain the same?

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5- Conclusions:

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