Give examples of devices that involve a wheel and axle.
The wheel and axle is one of the oldest inventions of humans, dating back to over 5,000 years ago. It is a simple machine consisting of a wheel attached to a central axle, allowing for the easy transfer of force. It is used in a variety of applications, from pulleys to vehicles, to increase mechanical advantage.
Wheel and Axle: An Ancient Inventon
Wheel and Axle: a simple machine consisting of two objects, the wheel and the axle, that are connected to one another so that the axle rotates when the wheel turns. Efficiency: the ability of a wheel and axle to do work with minimal effort or energy. Torque: the rotational force that is generated when a force is applied to the wheel and axle.
The wheel and axle is believed to have been invented in Mesopotamia around 3500 BC and the earliest known example was found in a pottery model of a four-wheeled wagon. In the ancient world, the wheel and axle was one of the most important tools for transportation and was used to create chariots and carts for carrying heavy burdens. The wheel and axle is a classic example of a simple machine. It is used to increase the amount of force that can be applied to an object; the force applied to the axle is multiplied by the radius of the wheel. A gear can often be thought of as a modified wheel and axle with teeth. Different sized gears can often be attached to the same axle in order to transfer, multiply, or change the direction of an input force.
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Compare and Contrast Single Pulleys to Block and Tackles
A wheel and an axle can be thought of an extension of what other simple machine?
A gear is a modification of what other simple machine?
If the input force were applied to a wheel to turn an axle, would the IMA usually be greater or less than 1?
What is the only real benefit of a single fixed pulley?
What makes a block and tackle less efficient than a single movable pulley?
How do you determine the IMA of a pulley system?
Brain break: Draw a slice of toast juggling butter and jam
What is a wheel and axle?
- A mechanical device consisting of two or more parts working together
- A type of bird
- A type of vehicle
- A tool for cutting
What is the purpose of a wheel and axle?
- To create a mechanical advantage
- To move heavy objects
- To increase efficiency
- To power a vehicle
What is the formula for calculating mechanical advantage of a wheel and axle?
- MA = T1/T2
- MA = W1/W2
- MA = R1/R2
- MA = D1/D2
A pulley system has an IMA of 5. Draw such a system and indicate the number of pulleys that it likely has.
Question: Your team is designing a new type of cart. What role can the wheel and axle play in the design of the cart? Clues: • The wheel and axle is a simple machine made up of two parts: a wheel attached to a smaller axle. • Wheel and axle can make work easier by increasing the force applied to an object. • Wheel and axle can also be used to change the direction of a force. In pairs: Select and solve one of the tasks: A. Work in pairs and explain your solution to the cart design using a drawing. B. Outline the components of the wheel and axle and explain how it can be used to improve the design of the cart.