Pulleys Class 8D science By:Student Name May 8th 2003.

Slides:

Advertisements

Similar presentations

Mechanical Systems Outcome 2: Structure and Function.

Advertisements

Chapter 14: Machines.

Chapter 5 Lesson 3.

Pulleys A simple machine.

Simple machine A simple device or invention for altering the magnitude or direction of a force. The six basic types are the lever, wheel and axle, pulley,

Pulleys. Fixed Pulley: Wheel attached to surface Changes the direction of the applied force NO mechanical advantage – same amount of force is required.

Fixed Pulley Movable Pulley Block and Tackle

Types of Simple Machines

CHAPTER 8 MACHINES.

Learning Objective: Students will be able to explain how machines help to make work easier by calculating mechanical advantage to examine the relationship.

Work and Machines.

Using Simple Machines to do Work More Easy Devices that allow us to perform the same amount of work more easily.

Inclined Plane Simple Machines.

Pulleys Simple Machines.

Science 8: Unit D: Mechanical Systems Topic 1: Levers and Inclined Planes.

#1UNIT D The amount by which a machine can multiply a force.

Simple machine force – distance trade-off:

Work and Machines Chapter 5 Sec 2. What is a Machine?  Any device that makes work easier.

OBJECTIVES 05-1 Explain the meaning of work. Describe how work and energy are related. Calculate work. Calculate power.

Simple Machines 5.3 Physical Science.

Simple Machines and Work. What is a Simple Machine?  A simple machine has few or no moving parts.  Simple machines make “work” easier.

Levers and Pulleys.

Pulleys A Pulley is a grooved wheel with a rope, chain, or cable running along the groove Change the direction of an applied force Transmit rotational.

Six Simple Machines. Simple Machines Simple machines are the six machines on which all other machines are based. –Lever –Wheel & Axle –Pulley –Inclined.

Work and Simple Machines

Lever A lever is a bar that is free to turn, about a fixed point.

Wedge Inclined Plane Screw Wheel and Axle Lever Pulley.

Part 1: Pulleys. What is a pulley? Pulleys may have been invented by Archimedes in ancient Sicily, about 250 BC.ArchimedesBC A pulley consists of a rope.

Simple Machine: The Pulley. Simple Machine Part of Lever Family made with a rope, belt or chain wrapped around a wheel. member of lever family a modified.

Pulleys By: Alexis, Thomas, & Ethan. What is a pulley? A pulley is a wheel on an axle that is designed to support movement on a cable or belt along its.

Levers and Pulleys. What is a fulcrum? The point where the lever arm moves.

Mechanical Advantage The measurement of how useful a machine is to the job.

Machines and Mechanical Advantage Archimedes (Greek mathematician, 287 to 212 B.C.) said, “Give me a place to stand and I will move the Earth,” meaning.

6 th Grade.  Machines that are used to reduce the amount of force required to do work  EX: Lift a load  But you must apply this force over a greater.

Work and Machines. What is Work? Work is force times distance. To be exact, work is force times the distance moved in the direction of the force. The.

Simple Machines Work and Simple Machines What is a Simple Machine?  A simple machine has few or no moving parts.  Simple machines make work easier.

Work, Machines, and Energy. Work and Power  Work is done if (1) an object moves, and (2) if a force acts in the same direction that the object moves.

Machines and Mechanical Advantage Archimedes (Greek mathematician, 287 to 212 B.C.) said, “Give me a place to stand and I will move the Earth,” meaning.

By Jonathan Lemmon and Brook Dreher. Definition of Pulley  a wheel with a grooved rim for carrying a line, that turns in a frame or block and serves.

Levers and Pulleys. Lever and Pulley Jeopardy DefinitionsLevers Pulleys Simple Machines Investigations 10 pt 20 pt 30 pt 40 pt 50 pt Bonus.

 A pulley is a wheel with a groove along its edge for holding a rope or cable.  It’s a simple machine that helps change the direction and point of application.

Define the following terms A. Work B. Power C. Machine S-34.

Simple Machines Inclined Planes Pulleys

Wheel and Axle Lever MACHINES Pulley Screw Wedge Inclined Plane.

Wedge Inclined Plane Screw Wheel and Axle Lever Pulley Simple Machines.

Simple Machines /Pulleys Quiz! Draw a box at the top to keep track of your points. Write the letter of the correct answer. Have your dry-erase boards.

Block and Tackle HO Debrief Tahoma Jr. High 8 th Grade Science Maple Valley, WA.

Section 5-4. A pulley is a rope wrapped around a wheel. Pulleys can change the direction or the size of a force.

Warm Up: 1/14/13  Give an example of a machine you use on a daily basis. Then say how you thinks it helps to make work easier.

LEVERS:. Pulleys  A pulley is a simple machine that is made up of a single wheel and an axel.  The wheel has a groove around it so a rope or cable can.

Simple Machines WHEEL AND AXLE PULLEYS. The Wheel and Axle The wheel and axle is another type of simple machine that moves objects across distances. Wheels.

Pulleys Vocab. Vocab  A Pulley is a wheel with a grooved rim in which a rope can run to change the direction of the pull (force) that lifts a load.

Topic 2: The Wheel and Axle, Gears, and Pulleys

LEVERS AND PULLEYS Simple Machines. LEVERS: A BEAM, FREE TO PIVOT AROUND A POINT, USED TO MOVE A LOAD.

 When a force causes an object to move in the same direction of the force that is being applied  Does effort always equal work?  Calculating Work ›

WorkMathPowerMachinesMisc Question What is the SI unit for work?

…what they are and how they work…

Work, Power, and Machines Physical Science. What is Work? Transfer of Energy Occurs when a force makes an object move a distance.

Chapter 11 work and machines. Anytime that you exert a force and cause an object to move in the direction of the applied force you do _________. work.

Simple Machines, Mechanical Advantage, and Work. Machines  Machines make work easier by changing direction of a force, multiplying a force, or increasing.

1.These two parts act as one simple machine. They roll and are found on cars and bikes. 2.This simple machine can be used to lift a weight. It has a fulcrum,

By: Shae Anderson.  A simple device for altering the magnitude or direction of a force.  A simple machine has few or no moving parts.  They are used.

Unit #4 Topic #2 Wheel and Axle, Gears and Pulleys

Simple Machines Inclined Planes Pulleys

Chapter 5 Lesson 3.

What is a pulley? A pulley is a wheel

Presentation transcript:

Pulleys Class 8D science By:Student Name May 8th 2003

DEFINITION A wheel with a grooved rim to guide a rope or chain that runs along the groove; used to transmit or change the direction of force lift.com/gifs/pulley- img.gif

Everyday Pulleys Pulley’s are used everyday, whether you know it or not, you are using pulley’s while working out, lifting heavy loads and in car engines.

Example of an everyday pulley:Work Out Machines. While working out some of the machines have pulley’s. So u pull on the bar it lifts up weights, stimulating your muscle, and your using a simple form of a pulley.

Example of an everyday pulley: A car engine In a car engine they use many complicated pulleys that cannot be seen. So while your driving whether you know it or not, your using a pulley.

Machanical advantage of a pulley The formula for mechanical advantage of a pulley is: MA= Force of Object Force puling down.

Mechanical Advantage Question For A Pulley If Someone is trying to lift up a rock that weighs 100 Newton's, and are exerting 10 Newton's of force what is the mechanical advantage? Would it be easier to use a pulley then just lifting it yourself?

Answer for the Mechanical Advantage problem The answer is: Mechanical advantage= 10 Newtons. It is easier to use a pulley then picking up a rock with your hands.