7.3 Wheels, pulleys, and blocks Science 14 with Mrs. M.

Slides:



Advertisements
Similar presentations
Chapter: Work and Machines
Advertisements

General Science Chapter 6
Chapter 14: Machines.
Chapter 14 Work & Simple Machines 4/12/2017 2:57 PM
Pulley.
Warm Up 1. What simple machine is a ladder?
Types of Simple Machines
Work, Power, & Simple Machines. Define / Describe WORK.
Work & Simple Machines. Define / Describe WORK Work is done when a force causes an object to move in the direction that the force is applied. The formula.
A machine helps you do work by changing the amount or direction of the force you need to apply. There are six basic types of simple machines.
Chapter 5 Work and Machines
Simple Machines. Would it require more work to take 100, 1kg books to the book room one at a time, or to take them in stacks of 20? Why?
Work and Machines.
Pulleys Simple Machines.
Work & Machines. Topics Work and Power –Definition, Calculation, and Measurement Using Machines –Nature of Machines –Mechanical Advantage –Efficiency.
Simple Machines.
Machines - Ch. 7 II. The Simple Machines (Chapter 8)  Introduction to Machines  Mechanical Advantage  Lever  Pulley  Wheel & Axle.
Simple Machines Device that makes doing work easier is a machine Machines increase applied force and/or change direction of applied force to make work.
Work and Machines Chapter 5 Sec 2. What is a Machine?  Any device that makes work easier.
Energy, Work, Power, and Machines
OBJECTIVES 05-1 Explain the meaning of work. Describe how work and energy are related. Calculate work. Calculate power.
(Are they really that simple?!) What have we learned by doing labs and researching for our notes?
Work, Power, Simple machines
Lecture 21 Using Machines Ozgur Unal
Machine notes CP Physics Ms. Morrison.
Forces Screws & Levers Who Am I? True or False Name.
Work, Power, and Simple Machines
Simple & Compound Machines: By: Mr. Manning. What is a Machine again…?  A machine is a device that helps make work easier.  A machine makes work easier.
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.
Machines Making Work Easier.
Physical Science Chapter 12.  devices that change the direction of a force or the size of a force that help us to do work  machines will multiply your.
Classification of simple machines: Simple machines are divided into two families: 1)The Lever family and 2) The inclined plane family.
WORK POWER SIMPLE MACHINES. I. WORK 1. What is work? A force acting through a distance No work is done on the object unless the object moves and the.
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.
What is Energy?  Definition: Energy is the ability to do work.  There are a lot of different types of energy; potential energy, kinetic energy, thermal.
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.
Work  Work is done when a force moves an object over a distance  Work = force X distance or W = f X d  When a force is applied to an object, the force.
Physical Science Chapter 5 Work and Machines 1 Note to self: Find videos.
Energy (The ability to do work) Potential energy: due to position ex. bungee jumper Kinetic energy: due to motion ex. baseball Thermal energy: heat ex.
Work, Power, and Machines Glencoe Chapter 5. A. Work is the transfer of energy that occurs when a force makes an object move. 1. For work to occur, an.
1 Work and Simple Machines. 2 What is work?  In science, the word work has a different meaning than you may be familiar with.  The scientific definition.
SIMPLE MACHINES Chapter 5 Notes.
Work, Machines, and Energy
Wedge Inclined Plane Screw Wheel and Axle Lever Pulley.
Work, Power, & Machines What is work ?  The  The product of the force applied to an object and the distance through which that force is applied.
Simple Machines.
DO NOW Prepare for Vocabulary Quiz over chapter % words Pick up notes sheet when you turn it in.
The Red Group’s Week. Wheel and Axle A wheel and axle is a simple machine made of two circular and cylindrical objects fastened together that rotate about.
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.
Test 6: Chapter 5 Work & Machines Honors Physical Science.
GPS Standards S8CS5a: Observe and explain how parts can be related to other parts in a system such as the role of simple machines in complex (compound)
Physical Chapter Seven Simple Machines Levers Pulleys Inclined Planes Screws Wheel & Axle Wedge Compound Machines.
Simple Machines. Before we begin, let’s review what work is… What is work? In which of the following situations is work being done? 1) Mr. Wood gives.
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.
Chapter 7 Review.
Simple Machines, Mechanical Advantage, and Work. Machines  Machines make work easier by changing direction of a force, multiplying a force, or increasing.
Simple Machines A simple machine is a device that can multiply a force or change the direction of a force.
Work 5.1 Power Suppose you and another student are pushing boxes of books up a ramp and load them into a truck. To make the job more fun, you make a game.
Advanced Physical Science Ms. Pollock
“Work, Power, and Simple Machines”
Simple Machines Device that makes doing work easier is a machine
Chapter 6 – Work and Machines
Wheel and Axle Lever Simple Machines Pulley Screw Wedge Inclined Plane.
MACHINE NOTES.
What is a machine? Device that makes doing work easier by increasing the force applied to an object, changing the direction of the applied force, or increasing.
Work, Power, & Machines.
Move It! Move It! : Machines Make It Simple
Chapter 8 Work and Machines.
Work, Power, and Simple Machines
Presentation transcript:

7.3 Wheels, pulleys, and blocks Science 14 with Mrs. M

Pulleys A pulley is a grooved wheel to support a rope or cable for a load Changes direction of effort

Equilibrium Opposing forces are balanced Weight of load = effort of pulling force

Fixed Pulley Effort force = load force

Movable Pulley Tied to the load Moves with the load Fixed Pulley Movable Pulley

Check Your Understanding P 144 #1 What is the difference between a fixed pulley and a movable pulley? #2 How does each type of pulley make work easier?

Wheel and Axle An axle is a shaft attached to a round wheel

Would it take more or less effort if the doorknob were smaller? Wheel and Axle

Screwdriver A screwdriver’s handle is large compared to the head of the screw Fat handle is wheel Screw is part of the axle Wheel and Axle

Wrench It is easier to turn the wrench handle in a circle than it is to turn the small nut Wheel and Axle

Winch Roller is the axle Turning crank is the wheel Wheel and Axle

Check Your Understanding P 144 #4 You find it difficult to put screws into a piece of wood. You cannot turn the screwdriver. Would you be better to change to a fat-handled or thin-handled screwdriver? #5 Give three examples of everyday items that use the wheel and axle as a force multiplier.

7.4 Spinning Our Wheels: Energy and Efficiency When a machine is used it loses energy through: – Friction – Heat – Poor combustion

Efficiency No machine is 100% efficient Efficiency compares the energy a machine uses with the work the machine does Work output is less than work input

Efficiency Around the House Leaving doors open, lights on, furnace on high, T.V. on, or all electronic chargers plugged in costs more on your energy bill Light bulbs waste heat energy

Kilowatt hours kW  h Amount of electricity used when 1000Watts is used for one hour Why might you use fewer kilowatt hours in summer than in winter?

Environmental Concerns Burning fossil fuels = pollution Fossil fuels are non-renewable Environmentalists advocate for higher efficiency devices to reduce emissions

Energy Conservation and Sustainability Reduce energy use – by turning off lights when leaving room – by carpooling Use renewable energy sources

Ch 7 Review Key Term Definitions or Reviewing Key Terms 2, 3, 4, 7a, 10, 11a

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.