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Stephen is pulling David up at a constant speed on a frictionless water slide.

System. 40 o. Earth. Stephen is pulling David up at a constant speed on a frictionless water slide. Which of the following statements best describes the situation?. Construct a statement involving energy and work that best describes the situation.

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Stephen is pulling David up at a constant speed on a frictionless water slide.

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  1. System 40o Earth Stephen is pulling David up at a constant speed on a frictionless water slide. Which of the following statements best describes the situation? Construct a statement involving energy and work that best describes the situation. 1 The energy in the system changes. This change is equal to the force that Stephen exerts on David multiplied by the distance David moves. 2 The energy in the system changes. This change is equal to the force that Stephen exerts on David multiplied by the distance David moves multiplied by the cos 40o. 3 David is moving at a constant speed, thus the net force exerted on David is zero. Zero net force means zero work. Thus, the energy of the system does not change.

  2. A situation is described with a bar chart. Construct a verbal description that matches this bar chart. Kinitial + Ug initial + Us initial + W = Kfinal + Ug final + Us final +DEint A situation is described with a bar chart and in words. Which verbal description matches this bar chart? 1 An object fell off a cliff and energy in the system was transferred from gravitational potential energy to kinetic energy. 2 A spring on a table shot an object. Youmeasured the kinetic energy of the object when it landed at the same elevation. 3 A spring shot an object vertically from a height above the ground. You then measure the kinetic energy at ground level just before the ball hits the ground.

  3. A situation is represented pictorially below. Construct a bar chart that best matches the picture. system y t, y = h ti, yi = 0 v = constant Earth Ko + UgoWK + Ug + Us 1 2 3 A situation is represented pictorially below. Which bar chart best matches the picture?

  4. y = constant x Earth Tim is carrying a basket of laundry to be washed. This motion is represented by a free body diagram and a motion diagram. Which verbal description best matches the diagrams? (The earth and basket are the system) Construct a verbal description that best matches the diagrams. (The earth and basket are the system) • Since the basket is moving, work is done on the basket and that is all we are able to tell. • Tim does work, but the systems energy does not change. • The velocity is constant, the height is constant and Tim is doing work. The internal energy of the system must be increasing. • No work is being done on the system which implies the system’s energy does not change.

  5. Alan is on a frictionless kiddie coaster. Which energy bar chart best matches this situation as the car goes to the bottom? Construct an energy bar chart that best matches this situation as the car goes to the bottom. hi=h vi=0 Ki + UgiW = Kf + Ugf h>hf >0 1 vf >0 Ki + UgiW = Kf + Ugf Ki + UgiW = Kf + Ugf 3 2

  6. If the same coaster was not frictionless, which bar chart would describe that process? If the same coaster was not frictionless, construct a bar chart would describe that process. hi=h vi=0 Ki + UgiW = Kf + Ugf + DE h>hf >0 1 vf >0 3 Ki + UgiW = Kf + Ugf Ki + UgiW = Kf + Ugf + DE 2

  7. A roller coaster car’s trip is described by the energy bar chart shown below. Ki + UgiW = Kf + Ugf Which final point in the picture below matches the bar chart? Construct a picture showing the final and initial points below that matches the bar chart. Initial 1 Final 3 Final y 5 Final 2 Final 0 4 Final

  8. The energy bar chart below represents a car’s motion. Ki + UgiW = Kf + DE Which motion diagram matches this situation? Construct a motion diagram that matches this situation. 2 1 4 3

  9. A car is moving horizontally as described by the motion diagram below. Ki + UgiW = Kf + Ugf 1 Which energy bar chart best matches this? Construct an energy bar chart that best matches the above motion diagram. 2 Ki + UgiW = Kf + Ugf 4 3 Ki + UgiW = Kf + Ugf Ki + UgiW = Kf + Ugf

  10. Ki + UgiW = Kf + Ugf Tim is moving a basket of laundry and his hands exert a force on the basket equal in magnitude to the force of the Earth on the basket. Which energy bar chart(s) could match this situation? (The earth and basket are the system) Construct an energy bar chart that could match this situation. (The earth and basket are the system) Ki + UgiW = Kf + Ugf 1 2 Ki + UgiW = Kf + Ugf Ki + UgiW = Kf + Ugf 3 4 5 3 & 4 6 2, 3 & 4

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