A box slides down a frictionless, 10-meter, 30o incline. Calculate the gravitational potential energy at both the beginning and end of the motion. Calculate the work done by GRAVITY as the box slides down the incline. Compare this to the overall change in gravitational potential energy. What conclusions can you draw from this?
2. Potential Energy is only stored in a system when... (How to finish it off)
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When a 5 kg box is lifted 3 meters from the ground, calculate the gravitational potential energy stored in the box. Calculate the work done by a Force to lift the box at a constant speed. Compare this answer to the amount of gravitational potential energy stored in the box. What conclusions can you draw from this? What would happen if you did more work lifting the box than what was stored as gravitational potential energy?
ΔUg= mg Δy
ΔUg= (5kg)(-9.8 m/s^2)(3m)
ΔUg= -147J ( gravitational potential energy)
Calculate work:
W= F * D
= (5kg)(-9.8 m/s^2)
=-49 J
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