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Work, Force & Simple Machines

Work, Force & Simple Machines. What do machines do?. Simple Machines will change the size or direction of a force in one motion. Compound Machines a system of two or more simple machines (the game mouse trap is a great example) .The following is a list of what machines do:

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Work, Force & Simple Machines

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  1. Work, Force & Simple Machines

  2. What do machines do? • Simple Machines will change the size or direction of a force in one motion. Compound Machines a system of two or more simple machines (the game mouse trap is a great example).The following is a list of what machines do: • Help us do work more easily. Machines do not save work from being done. • A machine can make the force you put into a machine greater. (ex. Pliers) • A machine can change the direction of the force you put in. ( ex. A Car jack) • A machine can increase the speed of the force. (ex. Bicycle)

  3. Machines have what is called mechanical energy, the energy of moving things. Some examples of mechanical energy are: wind, moving rocks, and waterfalls. The energy output compared to the energy input is called efficiency. Simple machines provide us with an advantage. This Mechanical Advantage is how many times the machine multiplies your effort.

  4. What is a force? A force is a push or a pull. In SI units, force is measured in newtons. One newton is about the amount of force it takes to lift a quarter-pound hamburger.

  5. What is Work? • In order for work to be done two conditions must be met. • An object must move. • A force must act on the object in the same direction as the object's motion.

  6. When doing work, a force must move an object some distance. The force and distance the object moves must also be in the same direction. Therefore if the object does not move no work is being done.

  7. A boy holding a book above a table is not doing any work. He may be exerting a force but NO work is being done. If you are carrying an object the direction of motion and the direction of the force are different. Therefor, NO work is being done.

  8. Take a look at the following pictures. Is work being done? yes yes NO

  9. Formula for WorkWork is measured in units called Joules (J). In order to calculate work you need to have the measurement for Force and Distance. Force is measured in Newtons (N). Distance in measured in units called Meters (M). W=FxD

  10. Work or Not? • According to the scientific definition, what is work and what is not? • a teacher lecturing to her class • a mouse pushing a piece of cheese with its nose across the floor

  11. Work or Not? • According to the scientific definition, what is work and what is not? • a teacher lecturing to her class • a mouse pushing a piece of cheese with its nose across the floor

  12. What’s work? A scientist delivers a speech to an audience of his peers. A body builder lifts 350 pounds above his head. A mother carries her baby from room to room. A father pushes a baby in a carriage. A woman carries a 20 kg grocery bag to her car?

  13. What’s work? A scientist delivers a speech to an audience of his peers. No A body builder lifts 350 pounds above his head. Yes A mother carries her baby from room to room. No A father pushes a baby in a carriage. Yes A woman carries a 20 km grocery bag to her car? No

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