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# Objectives - PowerPoint PPT Presentation

List five simple machines that you or someone in your family uses to help make work easier around the house. Objectives. Differentiate between the six simple machines. (SPI 0707.11.1) Determine the amount of force needed to do work using different simple machines. (SPI 0707.11.2).

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Objectives uses to help make work easier around the house.

• Differentiate between the six simple machines. (SPI 0707.11.1)

• Determine the amount of force needed to do work using different simple machines. (SPI 0707.11.2)

2-Square Vocabulary uses to help make work easier around the house.

• Complete the 2-square vocabulary activity in your scientist notebook with your group. Do the “yours” side for the 12 bell work words/phrases.

• Complete the scenarios with your group. Write the explanations on your next blank page in your scientist notebook.

• When you are finished, raise your hands and I will check your work.

• Work hard, smart, and QUICKLY!!!

Machine uses to help make work easier around the house.

YOURS:

textbook:

• A machine is a device that makes work easier by changing the size or direction of a force.

• Examples: wheelchair, scissors, chopsticks

Simple Machines uses to help make work easier around the house.

YOURS:

textbook:

• A machine or simple device without moving parts.

• Examples: lever, pulley, wheel & axle, inclined plane, wedge, screw

Work uses to help make work easier around the house.

YOURS:

textbook:

• Work is the transfer of energy to an object by using a force that causes the object to move in the direction of the force.

• Work is done on an object if two things happen: 1) the object moves as a force is applied, 2) the direction of the object’s motion is the same as the direction of the force.

• Examples: pushing a ball up a hill

Work or Not Work? uses to help make work easier around the house.

or

OR

YES

NO

YES

NO

Force uses to help make work easier around the house.

YOURS:

textbook:

• A push or a pull exerted on an object in order to change the motion of the object; force has size and direction.

• Examples: people, bulldozer, static electricity

Work Input/Work Output uses to help make work easier around the house.

YOURS:

textbook:

• Work input is the work done on the machine.

• Work output is the work done by the machine.

• Examples: opening a paint can

Lever uses to help make work easier around the house.

YOURS:

textbook:

• A lever is a simple machine that has a bar that pivots at a fixed point, called a fulcrum.

• Examples: first-class lever (see saw), second-class lever (wheelbarrow or soda bottle opener), third-class lever (lifting weights or hammering a nail)

Three Classes of Levers uses to help make work easier around the house.

Levers uses to help make work easier around the house.

Pulley uses to help make work easier around the house.

YOURS:

textbook:

• A simple machine that has a grooved wheel that holds a rope or a cable.

• Examples: fixed, moveable, block and tackle

Movable pulleys do increase force, but they also increase the distance over which the input force must be exerted.

A fixed pulley and a movable pulley are used together; the mechanical advantage of a block and tackle depends on the number of rope segments.

The pulley changes the direction of the force. Elevators make use of fixed pulleys.

Pulleys the distance over which the input force must be exerted.

Which of the pulley systems shown below will lift the weight using the least amount of effort force?

Wheel & Axle the distance over which the input force must be exerted.

YOURS:

textbook:

• A simple machine consisting of two circular objects of different sizes.

• Examples: car’s wheel & axle, faucet

Wheel & Axle the distance over which the input force must be exerted.

Effort force applied to a wheel is ____________ when it is transferred to the axle because the axle travels a ___________ distance than the wheel.

multiplied, longer

divided, longer

multiplied, shorter

divided, shorter

Inclined Plane the distance over which the input force must be exerted.

YOURS:

textbook:

• A simple machine that is a straight, slanted surface; a ramp.

• Examples: ramp or slide

Inclined Plane the distance over which the input force must be exerted.

Wedge the distance over which the input force must be exerted.

YOURS:

textbook:

• A simple machine that is made up of two inclined planes and that moves; often used for cutting.

• Examples: knife, axe, door stop

Wedge the distance over which the input force must be exerted.

Select the choice that best completes the following sentence. When an axe is used to chop wood,

the axe blade acts as a wedge and changes the direction of the input force.

the axe blade acts as a wedge and does not change the direction of the input force.

the axe blade acts as a lever and does not change the direction of the input force.

the axe blade acts as a lever and changes the direction of the input force.

Screw the distance over which the input force must be exerted.

YOURS:

textbook:

• A simple machine that consists of an inclined plane wrapped around a cylinder.

• Examples: screw, light bulb

Screws the distance over which the input force must be exerted.

Which of the screws below requires the least amount of effort force to turn?

X.

Y.

Z.

W.

Compound Machine the distance over which the input force must be exerted.

YOURS:

textbook:

• A machine made up of more than one simple machine.

• Examples: manual can opener

YOURS: the distance over which the input force must be exerted.

textbook:

It is 10 times easier to use a ramp to move a heavy object.

A machine’s mechanical advantage is the number of times the machine multiplies force; how much easier it is to do the work using that specific machine.

Examples:

Write the question & answer. the distance over which the input force must be exerted.

SCENARIOS the distance over which the input force must be exerted.

Fill out the chart as we go through the Simple Machines activity on the Edheads website.