KINETIC AND POTENTIAL ENERGY CHANGES
Label the points at which:
______The skier is gaining speed
______ The point at which the skier is moving the fastest
________ The point at which the skier has the greatest
amount of potential energy
_____ The point at which the potential energy is changing to
kinetic energy
_____ The point at which the skier has the greatest amount
of kinetic energy
____ The point at which kinetic energy is changing to
potential energy
Explain why the skier will never return to the height of
point A.
Where and how is mechanical energy “lost?”
A tennis ball undergoes several energy changes as it travels
towards a player, is struck, and rapidly speeds back over the net. Describe
these energy changes using the concepts of kinetic and potential energy
CONSERVATION OF ENERGY DIAGRAM SKILLS
A roller coaster with a mass of m moves along a smooth track
as diagrammed in the graph. The car leaves point A with no initial velocity and
travels to other points along the track. The zero energy level is taken as the
energy of point A.
1a) What is the car’s kinetic energy at point A?
b) What is the potential energy associated with the car at
point A?
c) What is the car’s kinetic energy at point B?
d) What is the cat’s potential energy at point B?
2a) What is the speed of the car at point A?
b) What is the speed of the car at point B?
3. Assume the mass of the car is 65 kg, and it starts at 30
m above the ground (each square is 5 m). Use the graph above to find the
kinetic energy, potential energy, and velocity for points C,D,E<F,G
Location 
KE_{A} 
PE_{A} 
KE _{location} 
PE _{location} 
V _{location} 
A 





B 





C 





D 





E 





F 





G 





4. For each location, what do you notice about the sum of the kinetic and potential energies?