Academic Enrichment Warm Up 9-8-14 September 7, 1927 was the day the first all-electronic television image was transmitted. What type of an influence do you think television has had on our world? What have been some of the advantages? Have there also been some
disadvantages? Academic Enrichment Closure 9-8-14 Hank has a glass of water. Which of the following tools could he use to measure the volume of water he has in the glass? A. a graduated cylinder B. a triple beam balance C. a spring scale D. a metric ruler
2 Science Warm Up 9-8-14 If you are in a crowded hallway and the people behind you are pushing with the same force as the people in front of you, which way would you move? A. sideways B. backward C. no movement
D. forward Science HW Due Tuesday Textbook page 591 Questions #1-9 BRING SCIENCE BOOKS TO CLASS TOMORROW Simple Machines
GLE 0707.11.1 Identify six types of simple machines. Machine a tool that helps us do work Machines help us by: 1. Changing the amount of force on an object. 2. Changing the direction of the force. A simple machine is a machine with few or no moving parts
Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it. Simple machines have few or no moving parts
Lever Inclined Plane Wedge Screw Wheel and Axel Pulley
Lever made of a board or bar set on top of a fulcrum. It is used to lift weight. Levers are used to apply a force to a load. There are three classes of levers, which are based on the placements of the fulcrum, the load, and the input . force
Example: seesaw, crowbar, baseball rake bat, First Class Lever- a first-class lever, the fulcrum is between the input force and the load . Common
examples of firstclass levers include crowbars, scissors, pliers, tin snips and seesaws. Second Class Lever-The load of a second-class lever is between the fulcrum and the input force Examples of
second-class levers include nut crackers, wheel barrows, doors, and bottle openers. Third Class Lever-The input force in a thirdclass lever is between the fulcrum and the load. Examples of third-class
levers include tweezers, arm hammers, and shovels. Inclined Plan a slanted surface to make lifting easier Example: ramp, stairs
Wedge two inclined planes together used to raise an object or split an object. Example: knife, door wedge, ax Screw an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes. Example: drill bit, screws
Wheel and Axel a wheel that turns on a post to help move things quickly and easily Example: steering wheel, doorknob, screwdriver Pulley made of rope and string wound around a reel to change the direction of a force. Example : flagpole, clothesline, cranes, fishing reel
Compound Machine two or more simple machines working together. Examples: Bike Car After Video Questions 1. A machine is a device that does one or more of the following three things: makes work
easier, makes work faster, or ___________. a. uses a force b. is a push or pull c. changes the direction of the effort d. includes one of the simple machines 2. A compound machine is ___________. a. made up of two or more simple machines b. a tool that uses a force to move an object
c. made up of a wedge and lever d. very expensive 3. What are the six simple machines? 4. What simple machines are found in a wheelbarrow? a. lever and inclined plane b. wedge and wheel and axle c. lever and wheel and axle d. inclined plane and wedge
5. What simple machines are found in a pencil sharpener? a. lever and inclined plane b. wedge and wheel and axle c. lever and wheel and axle d. inclined plane and wedge Science Closure 9-8-14 A logger splits a piece of wood. What simple machine splits the wood?
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