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Simple Machines. Essential Questions. What is the purpose of the simple machines?. Simple Machine Types. There are 6 basic kinds of simple machines. These are: Inclined Plane Wedge Screw Levers Wheel and Axle Pulley. Inclined Plane. An inclined plane is a flat, slanted surface.

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essential questions
Essential Questions
  • What is the purpose of the simple machines?
simple machine types
Simple Machine Types
  • There are 6 basic kinds of simple machines.
  • These are:

Inclined Plane




Wheel and Axle


inclined plane
Inclined Plane
  • An inclined plane is a flat, slanted surface.
  • An example of an inclined plane is a ramp.
  • The longer the inclined plane, the less input force you need to push or pull an object.
  • Even though an inclined plane has no moving parts, work is lost due to friction.
  • This is because friction comes from the bottom of the box rubbing against the ramp.
  • A wedge is a device that is thick at one end and tapers to a thin edge at the other end. A wedge is used to cut through an object.
  • You can think of a wedge as an inclined plane that moves.
  • The longer and thinner the wedge is, the less input force is required.
  • An example of a wedge is: an axe, a knife, a screwdriver, boat.
  • A screw can be thought of as an inclined plane wrapped around a cylinder.
  • An example of a screw is a jar lid, a bolt, and a faucet.
  • A lever is a rigid bar that is free to pivot or rotate around a fixed point.
  • The fixed point that a lever pivots around is called the fulcrum.
  • There are 3 classes of levers.
first class levers
First-Class Levers
  • First class levers have the fulcrum located between the input force and output force.
  • For example, scissors, seesaw, and pliers are first-class levers.
second class levers
Second-Class Levers
  • Second-class levers have the fulcrum located closer to the output force.
  • Examples of second-class levers are nutcrackers, doors, bottle openers, and wheelbarrows.
third class levers
Third-class Levers
  • Third-class levers have the fulcrum located closer to the input force.
  • Examples of third-class levers are fishing poles, shovels, and baseball bats.
  • BrainPop Video
wheel and axle
Wheel and Axle
  • A wheel and axle is a simple machine made of 2 circular or cylindrical objects (wheels)that are fastened together and rotate around a common object (axle).
wheel and axle1
Wheel and Axle
  • The larger object is called the wheel and the smaller object is called the axle.
  • An example of a wheel and axle is a screwdriver, door knob, or steering wheel.
  • BrainPOP video
  • A pulley is a grooved wheel with a rope wrapped around it.
  • You use a pulley by pulling on the rope.
  • A pulley that you attach to a structure is called a fixed pulley.
  • If you attach a pulley to the object you wish to move, then you are using a movable pulley.
  • If you combine fixed and movable pulleys, you can make a pulley system.
compound machine
Compound Machine
  • A machine that utilizes two or more simple machines is called compound machine.
  • Examples are: bicycle, pencil sharpener, bulldozer.
compound machine1
Compound Machine
  • Gears form a compound machine with one wheel and axle linked to another wheel and axle.
  • What machine works with gears? Bicycle
mega point review
Mega Point Review
  • How does a doorknob work?

The knob is a wheel and the axle pulls in the closer so the door will open.

  • What on a lever does not move?


mega point review1
Mega Point Review
  • How are wedges and screws related?

Both have inclined planes.

  • What are three ways in which a machine can make work easier?

By changing the force, distance, or direction

mega point review2
Mega Point Review
  • How can you determine if work is done on an object?

Work is done when an object moves.