- Aerated Water
- Air Engine
- Air Table
- Are you Hot or Not?
- Balancing Act
- Bending Beams
- Block the gap
- Braille
- Bridge the Gap
- Chalk Wall
- Changing Faces
- Chaotic Motion
- Circle of Discovery
- Circle of Discovery- The Internet
- Circle of Discovery-Bridge Design
- Circle of Discovery-Ideas hub
- Circle of Discovery-Internet
- Circle of Discovery-Medicine
- Circle of Discovery-photography
- Circle of Discovery: Design - Earthquake
- Circulation
- Colour Wheel
- Communication Codes
- Communication Dishes
- Computer
- Crystallography
- Digestive System
- Down the Drain
- Electromagnetic Spectrum
- Fibre Optics
- Flight Simulator
- Gear Table
- Handshake Mirror
- Harmonograph
- High Flyer
- Hit the Target
- Horizontal Periscope
- Human Battery
- It's Electric
- Larger Than Life
- Lift Me Pull You
- Light Table
- Lock Box
- Making Waves
- Mini Harmonograph
- Mobile Phone
- Move It
- Nervous System
- Newtons Cradle
- Organ Pipe
- Organ Pipe Tune
- Oscillating Pendulums
- Pendulums
- People Power
- Periscope
- Prove Pythagoras
- Radar
- Radio Station
- Reactable
- Reflection Refraction
- Robot Arm
- Science of Sport
- Sensation
- Simple Camera
- Simple Circuits
- Smoke Tunnel
- Solar Energy
- Sound Waves
- Structures and Stresses
- Telescope
- The Exhibition
- The Eye
- The Lung and Chest Cavity
- The Wheel Race
- Thermal Imager
- Tornado
- Tower of Hanoi
- Universe Wall
- Up and Down
- Vertical Periscope
- Viscosity
- Viscosity Plungers
- Volume and Mass
- Vortex
- Watch Your Waste
- Weight Lifter
- Wheels Within Wheels
- Wind Tunnel
Lift Me Pull You
Lift me, Pull You demostrates the advantages of using pullies
Activity.... Do - Think - Learn
Pulleys and wheels have grooves to carry ropes, chains or belts. They can be used to link different mechanisms and to reduce the effort needed to move a load.
- Which of the weights will be the easiest to lift?
- Which end of the tug-of-war is easier?
- Can you link the rudder to the wheel?
- Why do pulleys make it easier to move thing?
The Science Bit
A simple pulley is a hoist for raising heavy loads and is used in many aspects within the work place when a load is too heavy to lift directly. For example, fishing boats use these simple pulleys to lift fish nets from the sea and from boats once docked. A more complicated mechanism will use more than one pulley so that even heavier loads can be lifted from a given effort. There are many different types of these more complicated pulleys, for example a block and tackle pulley. To lift a load through a distance the tension in the rope is less but you need toThese more complicated pulleys give a mechanical advantage. If a block and tackle pulley was used with three ropes you would be able to lift with 1/3 of the effort than lifting directly; which gives you a mechanical advantage of three.
Curriculum Links
Pushes and Pulls
- That there are many sorts of movement which can be described in many ways
- To identify similarities and differences between the movement of different objects
- That pushing and pulling things can make objects start or stop moving
- To make suggestions about how objects can be made to move and to find out whether they were right
- To recognise hazards and risks to themselves in moving objects
Forces and movement
- That pushes and pulls are examples of forces
- That sometimes pushes and pulls change the shape of objects
Friction
- That there is a force between an object and a surface which may prevent the object moving
- That the force between two moving surfaces in contact is called friction
- That friction can be useful
Forces in Action
- That weight is a force and measured in Newton’s
- That several forces may act on one object
- That the Earth and objects are pulled to wards each other; this gravitational attraction causes objects to have weight
Last Modified: 28/07/2011
