Simple Machines

the use of force to move an object over

a distance

work

For work to be done, an object has to

move

When using a simple machine, the

number of forces applied are

1

a bar that tilts or pivots on a fixed

point

lever

a fixed point on a lever

fulcrum

What decreases the force needed on a

lever?

Moving the load closer to the fulcrum

What kind of lever?

lever with the load between the force and the fulcrum

Second Class

lever with the fulcrum between the effort and load

What kind of lever?

First Class Lever

What kind of lever?

lever with the effort between the force and load

Class 3

a simple machine made of a wheel and a rod that turn

together

Wheel and axle

a rod between two wheels

axle

A big wheel makes the turning force easier, but it will require a

longer

distance

a surface

plane

a slanted surface

Inclined plane

What is easier? Lifting something straight up

Or Pushing up an inclined plane

Inclined Plane

Which is easier?

Steep slope

Flatter slope

Flatter slope

easier

harder

an inclined plane wrapped around a

post

Screw

Inclined plane requires a longer

distance

made of two inclined planed put back to

back

wedge

A wedge can be used to _____ and ______

Cut and lift

A pulley can change the _______ of a

force.

direction

Adding pulleys can _____________ the force needed

reduce

Which two simple machines are most

alike?

screw and inclined plane

Which simple machine would be

best to slice carrot?

wedge

Which of the following changes the direction of a force but not the amount of force needed to

do work?

Single pulley

How do we use a pulley everyday at

school?

flagpole

What is transferred when work is done?

energy

Which part of the lever supplies the

force to move something?

effort

Which part of the lever is the part you are trying to move?

load

What are the two types of forces?

Push and Pull

This is necessary to get something

moving

force

How many classes of levers are there

3

These two simple machines make a

screw

Wheel and Axleand Inclined Plane

If you use a screw driver to open a can

of paint, you are using it mostly as a

lever

If you weigh 80 pounds, and you are lifting an object with one pulley, the object has to

weigh how much?

80 pounds or less