Energy: Important Facts
About the Lecture
The lecture Energy: Important Facts by Jared Rovny, PhD is from the course Energy of Point Object Systems.
Included Quiz Questions
An object of mass m sits on the ground. The origin of coordinate system 1 is set to ground level but the origin of coordinate system 2 is set to 10 m below ground level. In both coordinate systems the upward direction is the positive direction. What is the object's gravitational potential energy U₁ and U₂ in coordinate systems 1 and 2, respectively?
- U₁ = 0 , U₂ = 10 mg
- U₁ = U₂ = 0
- U₁ = 0 , U₂ = -10 mg
- U₁ = U₂ = 10 mg
- U₁ = -10 mg , U₂ = 10 mg
An object of mass m sits on the ground. The origin of coordinate system 1 is set to ground level but the origin of coordinate system 2 is set to 10 m below ground level. In both coordinate systems the upward direction is the positive direction. If the object is moved from ground to a height of 5 m above the ground what is the change in the gravitational potential energy of the object ΔU₁ and ΔU₂ in coordinate systems 1 and 2, respectively?
- ΔU₁ = ΔU₂ = 5 mg
- ΔU₁= 5 mg , ΔU₂ = 15 mg
- ΔU₁ = ΔU₂ = 15 mg
- ΔU₁ = 5 mg , ΔU₂ = 10 mg
- ΔU₁ = 15 mg , ΔU₂ = 5 mg
Which of the following choices accurately describes the proportionalities for kinetic energy (K), gravitational potential energy (U₉), and spring potential energy (Us)?
- K ∝ v², U₉ ∝ h, Us ∝ (x - x₀)²
- K ∝ v² , U₉ ∝ (x - x₀) , Us ∝ h²
- K ∝ v² , U₉ ∝ gh , Us ∝ k²
- K ∝ v²/2, U₉ ∝ mgh, Us ∝ x/2
- K ∝ mv, U₉ ∝ mgh, Us ∝ m(x - x₀)
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Author of lecture Energy: Important Facts
Jared Rovny, PhD
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