No friction on the track No because his potential energy will be converted to thermal energy No because he doesnt have enough potential energy Yes because all of his potential energy will be converted to kinetic energy ID: 544435
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Slide1
1. Do you think the Skater will make it over the first hump? (No friction on the track)
No, because his potential energy will be converted to thermal energyNo, because he doesn’t have enough potential energyYes, because all of his potential energy will be converted to kinetic energyYes, because some of his energy will be potential and some kineticSlide2
2. Do you think the Skater will make it over the first hump?
(
lots of
track
friction)
No, because his potential energy will be converted to thermal energy
No, because he doesn’t have enough potential energy
Yes, because all of his potential energy will be converted to kinetic energy
Yes, because some of his energy will be potential and some kineticSlide3
3. Do you think the Skater will make it over the first hump? (No friction on the track)
No, because his potential energy will be converted to thermal energyNo, because he doesn’t have enough potential energyYes, because all of his potential energy will be converted to kinetic energyYes, because some of his energy will be potential and some kineticSlide4
4. Do you think the Skater will make it over the first hump? (lots of
track friction)No, because his potential energy will be converted to thermal energyYes, if not too much energy is converted to thermal
Yes, because all of his potential energy will be converted to kinetic energyYes, because some of his energy will be potential and some kineticSlide5
5. In the next moment, the KE piece of the pie gets larger, then
The Skater is going up hill (left)The Skater is going down hill (right)There is no way to tellSlide6
6. In the next moment, the KE piece of the pie gets larger, then
The PE part stays the sameThe PE part gets larger too The PE part gets smaller
There is no way to tellSlide7
7. In the next moment, the KE piece of the pie gets larger, then
The Skater will be going fasterThe Skater will be going slowerThere is no way to tellSlide8
8. The dotted line on the chart shows the energy of the Skater, where could she be on the track?
A
B
C
D
ESlide9
9. The bar graph shows the energy of the Skater, where could she be on the track?
A
B
C
D
ESlide10
10. The pie graph shows the energy of the Skater, where could she be on the track?
A
B
C
D
E
PE
KESlide11
11. If the ball is at point 4, which chart could represent the ball’s energy?
2
1
3
4
KE
PE
A.
B.
C
.
D.Slide12
12. If a heavier ball is at point 4, how would the pie chart change?
2
1
3
4
No changes
The pie would be larger
The
PE
part would be larger
The
KE
part would be larger
KE
PESlide13
13. As the ball rolls from point 4, the KE bar gets taller. Which way is the ball rolling?
2
1
3
4
At 4
Next step
Up
Down
not enough infoSlide14
14. The Energy chart of a boy skating looks like this
How would you describe his speed? He is at his maximum speedHe is stopped
He is going his average speedHe is going slowHe is going fastSlide15
15. The Energy chart of a boy skating looks like this
How would you describe his speed? He is at his maximum speedHe is stopped
He is going his average speedHe is going slowHe is going fastSlide16
16. Select a letter for each: stopped, slow and fast
C
B
A
Slow
Stopped
FastSlide17
17. Sketch this energy position graph. Label where the 5 spots, A-E, could be
He is going his maximum speedHe is stoppedHe is going his average speedHe is going slowHe is going fast
Energy vs Position
KE
PESlide18
Pendulum height
18
.
How high will pendulum rise?
A) Less than h
B)
h
C) More than h
h
Reference level (h = 0)Slide19
Velocity from PE
19. A 5000 kg coaster is released 20 meters above the ground on a frictionless track. What is the approximate speed at ground level? (point A)
7 m/s
10 m/s
14 m/s
20 m/s
none of the above
Slide20
20.
What is its approximate speed at 10 meters high (point B )?A) 7 m/s
B) 10 m/sC)
14
m/s
*
Correct answer but not the right sig figs
D) 20 m/s
E)
none of the aboveSlide21
21. How fast would the coaster have to be going at the start to reach 21 meters high (point C)?
A)
1.1 m/sB) 3.2 m/sC) 4.5 m/s
D) 20 m/sSlide22
Pendulum speed
22
.
Calculate velocity at B if h = 0.45 m, g = 10 m/s
2
A) 3 m/s
B) 4.5 m/s
C) 7.5 m/s
D) 9 m/s
h
Reference level (h = 0)
A
B