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Machines

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Machines help people work by increasing the amount of force applied or changing the distance over which force is exerted. Simple machines like nail clippers and chopsticks have one or two parts, while compound machines like cars and airplanes contain multiple simple machines. While machines make work easier by amplifying force or distance, not all energy input is used to do work as some is lost to friction between moving parts.

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Lesson 1How do machines help people work?Using force in order to move an object a certain distance.Work is measured in an unit called joule (J).W= F X DMultiply the force and distance to measure work.
Work and MachinesMachineAny device that helps people do work.Simple MachinesMade of one or two parts.Nail clippers and chopsticks.Compound MachinesCars, trucks, airplanes.Has one or more simple machines among its parts.
How machines helpThey make it easier to workA car jack and a crowbar are examples of machines that increase the amount of force to lift or move an objectOther machines change the distance over which force must be applied.
Machines and FrictionNot all the energy you put into machine is used to do work because some energy is lost due to friction.Friction is created when the moving parts of a machine rub together.There are ways to reduce friction.Using wheels and rollers.Friction creates heat and slows down machine?s parts.Coating the machine parts with grease , oil or wax.

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Machines

  • 1. Lesson 1How do machines help people work?Using force in order to move an object a certain distance.Work is measured in an unit called joule (J).W= F X DMultiply the force and distance to measure work.
  • 2. Work and MachinesMachineAny device that helps people do work.Simple MachinesMade of one or two parts.Nail clippers and chopsticks.Compound MachinesCars, trucks, airplanes.Has one or more simple machines among its parts.
  • 3. How machines helpThey make it easier to workA car jack and a crowbar are examples of machines that increase the amount of force to lift or move an objectOther machines change the distance over which force must be applied.
  • 4. Machines and FrictionNot all the energy you put into machine is used to do work because some energy is lost due to friction.Friction is created when the moving parts of a machine rub together.There are ways to reduce friction.Using wheels and rollers.Friction creates heat and slows down machine?s parts.Coating the machine parts with grease , oil or wax.