1Phy 14051Key Concepts:1. Newton’s 3rdLaw2. Support Force3. Work4. EnergyPhy 14052Clicker QuestionA ramp makes lifting a box easier because…A) You can use less energy to lift the boxB) The ramp exerts some force on the boxC) A ramp lets you use wheelsPhy 14053•Lifting an object straight up is often difficult•Pushing the object up a ramp is usually easier•The ease depends on the ramp’s steepness•Shallow ramps require only gentle pushes•You seem to get something for nothingObservations About RampsPhy 140544 Questions about Ramps•Why doesn’t the cart fall through the ramp?•Are both cart and ramp pushing on each other?•Why is it easier to push the cart up a ramp?•Is there a physical quantity that’s the same for any trip up the ramp, regardless of its steepness?
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