5 A load of bricks rests on a tightly coiled spring then is launched into the

# 5 a load of bricks rests on a tightly coiled spring

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5. A load of bricks rests on a tightly coiled spring, then is launched into the air. 6. A crate is propelled up a hill by a tightly coiled spring. y 0 v>0 Final v o =0 y o =0 y 0 v>0 v o =0 y o =0 Initial Final Initial y 0 v = 0 y > 0 v o =0 y o =0 Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int
©Modeling Workshop Project 2006 3 Unit VII ws3a v3.0 7. A bungee jumper falls off the platform and reaches the limit of stretch of the cord. 8. An elevator, initially moving downward, is brought to rest on the ground floor. 9. Create your own situation and construct corresponding energy bar graphs and system schema. System = ______________________ y 0 system boundary y o >0 v o >0 y = 0 v = 0 Final y 0 Initial v = 0 Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int
©Modeling Workshop Project 2006 1 Unit VII ws3b v3.0 Name Date Pd UNIT VII: WS 3b Quantitative Bar Graphs and Problems For each situation shown below: 1. In the energy flow diagram show the system you choose to analyze. Assume the systems to be frictionless unless stated otherwise. 2. Complete the energy bar graph QUANTITATIVELY (numerically accurate). 3. In the space below each diagram use conservation of energy equations to solve for the quantity called for in the question. 1.A moving cart hits a spring, traveling at 5.0 m/s at the time of contact. At the instant the cart ismotionless, by how much is the spring compressed? 2. Determine final velocity of the cart, assuming that 10% of the energy is dissipated by friction. 3.A block is placed on a spring, compressing it 0.30m. What height does the block reach whenlaunched by the spring? 5 0 height (m) v = 0 v = ? m = 20 kg m = 500 v = 0 Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int Energy Flow Diagram 0 E K E el Initial E g 0 Final E K E g E el E int
4.The bullet strikes a block of wood which exerts, on average, a force of 50,000N opposing the motionof the bullet. How far does the bullet penetrate? 5. A 200. kg box is pulled at constant speed by the little engine pictured below. The box moves a distance of 2.5 m across a horizontal surface. a) Draw a force diagram of all relevant forces acting on the box. b) Construct a qualitative energy bar graph/flow diagram for this situation. Be sure to specify your system. c) How much energy is transferred by the engine? d) What type of motion would occur if the engine pulled with a force of 500 N? Modify your force diagram and apply Newton's 2nd Law.

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