Consider one of the children in the photo below. If she is swinging with a typic

Question

Consider one of the children in the photo below. If she is swinging with a typical amplitude, what is her approximate maximum kinetic energy?

Which of the following statements or principles will be useful in solving this problem? the child's maximum kinetic energy will occur when she has her greatest speed, which will occur when the swing is at the lowest point on its trajectory. The sketch below shows the trajectory followed by one of the children as she swings. It also shows her height h relative to the bottom of her trajectory. To evaluate your expression for the potential energy in Part 3. we need values for m and h. Using the photo above, what is a reasonable estimate for m? Using the photo above, what is a reasonable estimate for h? Using your values for m and h, what is the maximum kinetic energy of the child?

Explanation / Answer

first four principles would be required

Pe = Mg*h

let's say mass of child = 30 kg

h = 0.5 meters

hence Pe = m*g*h = 30*10*0.5 = 150 joules

  

Kinetic energy potential energy = 150 joules

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