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Ch 6 Test: Controlling Heat Transfer
Please remove hats and hoods
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Ch 7 Simple Machines
Science 14 and 10-4 with Mrs M
Please remove your hats
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7.1 Many types of Energy
• We have already talked about thermal energy or heat
• Kinetic energy = energy of motion (recall temperature is the average of kinetic energy)
• What about the energy used in machines?
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Many types of energy
• Energy is the ability to do work
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Work = Force x distance
• W = F x d• Work is a form of energy measured in Newton
meter (Nm) or Joules (J)• Work is defined as a force applied over a
distance
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Which requires more effort or force, a short/steep or a long/gradual ramp?
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W = F x d
• A force of 20 N is required to lift a box. The box is lifted from the floor to a shelf that is 2m high. What is the amount of work done?
• W = F x d• W = 20 x 2• W = 40 Nm
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W = F x d
• Pushing a wheelbarrow takes 8000 Nm of work. How much force was needed to move it 25 m?
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Simple Machines
• Simple machines have one movement• The movement of an inclined plane/ramp is a
slide.• A ramp is an old simple machine
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Work requires a FORCE input over a DISTANCE
No Work
Work being done by pedaling force uphill
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Pushing against a wall is NOT work… because it’s not moving!
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Quick Quiz #5
• Open book• Individual
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Levers
• Lever: a rigid bar resting on a pivot, used to help move a heavy load/weight– Fulcrum= pivot point– Load= weight to be moved– Effort= force applied
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LeversFulcrum in middle 1st class
Load/Weight in the middle 2nd classEffort/Force in the middle 3rd class
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1st classEffort, Fulcrum, Load
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1st class levers
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1st classFulcrum in the middle
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2nd Class LeverLoad or Weight in the middle
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2nd class levers
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2nd classLoad or weight in the middle
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3rd Class LeversEffort or Force in the middle
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3rd class levers
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3rd class leverEffort in the middle
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FLE 123
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Why should a heavier person sit closer to the fulcrum on a teeter totter?
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Center of massGirl’s Work = Boy’s Work
Girl’s Force x girl’s distance = Boy’s Force x boy’s distanceWeight(girl)x d = Weight(boy)x d
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The little girl’s weight is 133 N and sits 0.5m from the middle of the teeter totter. How far
away does the boy sit if he weighs 265 N?
Weight(girl)x d = Weight(boy)x d133 x 0.5 = 265 x d
(133x0.5)/265 = d