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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

- October 5, 2022 - Edwin Tunner

 

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? 

 

………………………………………………………………………………………………

 

………………………………………………………………………………………………

 

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

 

………………………………………………………………………………………………

 

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

 

………………………………………………………………………………………………

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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………………………………………………

 

………………………………………………

 

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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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