Ch 6 Test: Controlling Heat Transfer

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Presentation transcript:

Ch 6 Test: Controlling Heat Transfer Please remove hats and hoods

Ch 7 Simple Machines Science 14 and 10-4 with Mrs M Please remove your hats

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?

Many types of energy Energy is the ability to do work

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

Which requires more effort or force, a short/steep or a long/gradual ramp?

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

W = F x d Pushing a wheelbarrow takes 8000 Nm of work. How much force was needed to move it 25 m?

Simple Machines Simple machines have one movement The movement of an inclined plane/ramp is a slide. A ramp is an old simple machine

Work requires a FORCE input over a DISTANCE Work being done by pedaling force uphill No Work

Pushing against a wall is NOT work… because it’s not moving!

Quick Quiz #5 Open book Individual

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

Levers Fulcrum in middle 1st class Load/Weight in the middle 2nd class Effort/Force in the middle 3rd class

1st class Effort, Fulcrum, Load

1st class levers

1st class Fulcrum in the middle

2nd Class Lever Load or Weight in the middle

2nd class levers

2nd class Load or weight in the middle

3rd Class Levers Effort or Force in the middle

3rd class levers

3rd class lever Effort in the middle

FLE 123

Why should a heavier person sit closer to the fulcrum on a teeter totter?

Center of mass Girl’s Work = Boy’s Work Girl’s Force x girl’s distance = Boy’s Force x boy’s distance Weight(girl)x d = Weight(boy)x d

Weight(girl)x d = Weight(boy)x d 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 d 133 x 0.5 = 265 x d (133x0.5)/265 = d

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