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Transcript
Bell Work Learning Target 1B Learning Targets Ranking Task – HW Due Monday Important Terms Qualitative Quantitative Learning Target 1C I can analyze a rotating system in static equilibrium using FBDs and Torque. Focus Question Why do objects rotate? Static vs. Dynamic Question Describe the difference between the two situations, and justify your answer. Bell Work – Quantatively prove your answer Read the Following pages Due Monday IBEs of Rotation Conditions For Equilibrium What must occur in order for a system to be in rotational equilibrium? Rotation Equalibrium What is your equation for equilibrium? Balance: Where should the large mass be placed? Justify your answer. CCW and CW What is Torque? Torque Torque describes the ability of a force to produce a rotational acceleration. Check Yo Self Defining the parts Learning Target 1C Forces at Angles I Do Learning Target 1C A uniform meterstick of mass 1kg is hanging from a thread attached at the sticks midpoint. One block of mass 3kg hangs from the left end at 0 cm and another block of unknown mass hangs at the 80cm mark. If the stick remains at rest, what is the value of the unknown mass? LT 1C Balance: Where should the mass be placed to produce equilibrium? .5 m 5kg x 1kg Rotational Equilibrium Characterisitics Balance: Where should a third mass be placed to produce equilibrium? We Do – Learning Target 1C You Do Learning Target 1C Active Practice Gallery Walk Prior Knowledge Check 1A,1B Closure How does Learning Target 1C connect to material we have already covered? Learning Target 1D I can analyze a rotating system with centripetal acceleration using FBDs and Newton’s Laws. Focus Question What happens when an object rotates? G-Force Trainer Circular Motion IBE Share Why does the pig move in a circle? If the string were cut how would the pig move? Is the pig accelerating? Bell Work Learning Target 1A Learning Targets Intervention Learning Target 1D I can analyze a rotating system with centripetal acceleration using FBDs and Newton’s Laws. Share Why does the pig move in a circle? The rope is holding it If the string were cut how would the pig move? Tangent to the rotation Is the pig accelerating? No it is constant Motion What is going to Happen? Why? What is going to happen to the tape as the car turns? Why does the tape slide? Is it Accelerating? Question If I apply a force will a mass accelerate? What is acceleration? Circular Motion The object’s velocity is: However it has an And it points toward the Assessment LT 1A Inclines Centripetal Acceleration The acceleration that points towards the center of rotation. 2 v aC r The time it takes an object to go once around a circular path is called the period. 2r v T What does this equation tell me? F ma Centripetal Force Is a force that points towards the center of rotation. A centripetal force accelerates an object by changing the object’s direction without changing the object’s velocity. Bell Work LT 1B Prior Knowledge Check 1A,1B Centripetal Forces String Rotating Vertically What is the object of focus? Draw the FBD I Do A pail of water of 10kg is rotated in a vertical circle of radius 1m. What must be the minimum speed at the top of the circle if no water is to spill out? I Do A rope of length 1m swings back forth with a 5kg mass attached to it as pictured below. If it has a velocity of 5 m/s. What is the tension at the bottom most point of its swing? We Do A rollercoaster cart has a mass of 500kg when fully loaded. If the vehicle has a speed of 20m/s at the bottom, what is the force of the track on the vehicle? What is it at the top of the hill A skateboarder performed a stunt where he rides his board through a loop. Assuming the loop has a radius of 2.7m, what is the minimum speed he needs to remain in contact with the loop at the top? Epic Fail: He doesn’t know his physics Curved Track Draw the FBD You Do A car of mass 2000kg rounds a circular turn of radius 20m. If the road is flat and = .7 between the tires and the road, how fast can the car go without skidding? Sample A crate of eggs is located in the middle of the flatbed of a pickup that negoiates a curve of radius 35m. If the coefficient of static friction is .6, what must be the maximum speed of the truck to prevent the eggs from sliding during the curve. Conical Pendulum Practice In a swinging mishap, Tarzan whose mass is 80kg finds himself circling around a tree in a horizontal circle at the end of a vine 3m long that makes an angle of 5 degrees. It takes him 10 seconds to complete 1 revolution. Find a. Centripetal Acceleration b. Tension of the vine Active Practice-Bingo Assessment LT 1A A 50 Kg block of ice is pushed across the floor with a Force of 20 N at a constant speed of 10m/s. Draw a free-body diagram of the ice. Find the force that the floor pushes up on the block. Find the force due to friction. Find the coefficient of friction. Mind Map Create a mind map that connects all learning targets together. Exit Slip Explain why an object moving in a circular path has an acceleration. Exit Slip What materials are you going to use to prepare for your test tomorrow? Station Instructions Max 4 people per station 3 levels in each station. Look at your learning targets and evaluate your ability. You choose the level you are at to practice and you will explain to me why you are at that level. Workout several problems in your practice notebook. Fill-out reflection on main concepts you need to focus on. LT 1D Circular Motion A frictionless rollercoaster does a vertical loop with a radius of 6.0m. What is the minimum speed that the roller coaster must have at the top of the loop so that it stays in touch with the rail? Hard Work Beats Out Talent Test Analysis Exit Slip Bell work LT 1A No Calculator Friction Forces What is acceleration? Circular Motion The object’s velocity is: However it has an And it points toward the Centripetal Force Movie Analysis Exit Slip At what point on a rollercoaster would I feel very heavy? Describe with an FBD and show with equations.