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## Types of Simple Machines

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## Presentation on theme: "Types of Simple Machines"— Presentation transcript:

Chapter: Work and Machines

5.3 Simple Machines.

Chapter 14: Machines.

Chapter 5 Lesson 3.

Simple Machines.

What are the six types of simple machines?

Work, Power, and Machines

Chapter 5 Work and Machines

Simple Machines Outline Notes

Work and Machines.

Simple machines and mechanisms Lesson 5.0 and 5.1 Pages

Work & Machines. Topics Work and Power –Definition, Calculation, and Measurement Using Machines –Nature of Machines –Mechanical Advantage –Efficiency.

Simple Machines The six types of simple machines are:

Work and Machines Chapter 5 Sections 1-3.

-a machine that does work with one movement

Lesson 2: Simple Machines

How Tools Work. The Six Simple Machines  Lever  Inclined Plane  Wedge  Screw  Pulley  Wheel and Axle.

Simple Machines Device that makes doing work easier is a machine Machines increase applied force and/or change direction of applied force to make work.

Chapter 14 Section 3.

Simple Machines

Section 2 What Is a Machine?

Machines: Making Work Easier by reducing the force used, But the distance to do the work increases and the amount of work is the same

• What Is Mechanical Advantage ? A machine’s mechanical advantage is the number of times the machine multiplies force.
• Calculating Mechanical Advantage You can find mechanical advantage by using the following equation:

• Input force-how much you put in divided by the Output force- What you get out.
• You will always lose some output force because of friction . Friction slows things down

Efficiency=output work/input work

Input and Output Work

• The amount of input work done by the gardener equals the amount of output work done by the shovel.

- How Machines Do Work

• The input force and output force for three different ramps are shown in the graph.
• Input force
• What variable is plotted on the horizontal axis?
• Interpreting Data:
• If an 80-N input force is exerted on Ramp 2, what is the output force?

• 1. Calculate the mechanical advantage of a hammer if the input force is 125 N and the output force is 2,000N
• 2. Find the efficiency of a machine that does 800 J of work if the input work is 24,000 J.
• 3. Find the force needed to lift a 2,000 N weight using a machine with a mechanical advantage of 15
• A lever is a ridged bar that is free to pivot, or rotate, on a fixed point.

- Simple Machines

Simple Machines in the Body

• Most of the machines in your body are levers that consist of bones and muscles.
• Levers are classified according to the location of the fulcrum relative to the input and output forces.

Calculate MA of Levers

• Input length divided by the output length
• To increase MA lengthen the input arm or move the fulcrum towards the object being moved
• M.A. =Input/output

Calculate the M.A. in your notes

Inclined Plane

• An inclined plane is a flat, sloped surface.

Section 3 Types of Machines

Inclined Planes

• An inclined plane is a simple machine that is a straight, slanted surface.
• Mechanical Advantage of an Inclined Plane The mechanical advantage ( MA ) of an inclined plane can be calculated by dividing the length of the inclined plane by the height to which the load is lifted.

Inclined Planes MA

• Length of the slope divided by the height of the plane
• To increase M.A., lengthen the slope of the plane

Calculate the following in your notes

• A pulley is a simple machine made of a grooved wheel with a rope or cable wrapped around it.

Pulleys, continued

You Increase M.A. by Increasing pulleys with rope segments

A fixed pulley has a fixed axle and is used to redirect the force in a rope

A fixed pulley has a mechanical advantage of 1.

movable pulley has a free axle, and is used to transform forces –

A movable pulley has a mechanical advantage of 2.

• The mechanical advantage can be increased by using a block and tackle, where there are several pulleys on each axle. Plutarch reported that Archimedes moved an entire warship, laden with men, using compound pulleys and his own strength.
• A wedge is a device that is thick at one end and tapers to a thin edge at the other end.
• A screw can be thought of as an inclined plane wrapped around a cylinder.

Wheel and Axle

• A wheel and axle is a simple machine made of two circular or cylindrical objects fastened together that rotate about a common axis.
• You can find the ideal mechanical advantage of a wheel and axle by dividing the radius of the wheel by the radius of the axle.
• Levers 3 types
• Incline Planes
• Wheel and axle
• Do we know what Acceleration and friction means?

• Preferences

## Simple Machines

Simple machines device that makes doing work easier is a machine machines increase applied force and/or change direction of applied force to make work easier effort ... – powerpoint ppt presentation.

• Device that makes doing work easier is a machine
• Machines increase applied force and/or change direction of applied force to make work easier
• Force applied to machine is effort force
• Resistance force force applied by machine to overcome resistance
• Amount of energy the machine transfers to the object cannot be greater than the amount of energy transferred to the machine
• An ideal machine with no friction would have the same input work and output work
• Some energy transferred is changed to heat due to friction
• The number of times a machine multiplies the effort force.
• Measure of how much of the work put into a machine is changed into useful output work by the machine.
• Bar that is free to pivot about a fixed point called the fulcrum
• MA of lever
• depends on the
• placement of
• the fulcrum
• Grooved wheel with a rope or cable running along a groove
• Machine with two wheels of different sizes rotating together
• Sloping surface that reduces the amount of force required to do work
• Inclined plane with one or two sloping sides
• Inclined plane wrapped in a spiral around a cylindrical post
• Uses a combination of two or more simple machines

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