Asked by Jazzy
a 40 kg child slides down a frictionless playground slide from a height of 2.0m.
What is her speed at the bottom of the slide?
Would the answer to part A change if she jumped straight down instead of sliding?
How would the answer to part A change if the slide were not frictionless?
Where does the lost energy go?
What is her speed at the bottom of the slide?
Would the answer to part A change if she jumped straight down instead of sliding?
How would the answer to part A change if the slide were not frictionless?
Where does the lost energy go?
Answers
Answered by
bobpursley
look at energy:
KE at bottom=PEat top + KE initial0- fricton
if she started at zero velocity
1/2 m v^2=mg*2 + O - 0
solve for v at the bottom.
Now if she jumpted straight down, she would have KE initial, and v would be differnt.
If it had friction that woujld be in the equation above.
Lost energy: heat mainly
KE at bottom=PEat top + KE initial0- fricton
if she started at zero velocity
1/2 m v^2=mg*2 + O - 0
solve for v at the bottom.
Now if she jumpted straight down, she would have KE initial, and v would be differnt.
If it had friction that woujld be in the equation above.
Lost energy: heat mainly
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