Simple Machines Grade 4

22 terms by lmntree123 

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Force

A push or pull

spring scale

a tool used to measure force or weight

work

is force and motion, work only gets done when a force is used to move an object

machine

anything that makes work easier

inclined plane

a slanted surface which is sometimes called a ramp

wedge

simple machine that is two inclined planes joined together to form a sharp edge

lever

a simple machine, a bar resting on a point

screw

a simple machine, a winding inclined plane

wheel and axle

A simple machine that is a wheel that turns on a rod(axle)

pulley

a simple machine that is a wheel with a rope moving around it

fixed pulley

is a pulley that stays in place as the load moves

movable pulley

is a pulley that moves with the load

fulcrum

the turning point of the lever

load

the object being lifted or moved by a simple machine(what you need to lift)

friction

a force caused when one object rubs against another

name the six types of simple machines and their uses

inclined plane, lever, wedge, screw, pulley, & wheel and axle

How is friction helpful?

It can prevent slipping on a smooth surface, used to brake(stop), a bike, and can be used to start a fire.

How is friction problematic?

Too much friction makes heavy objects hard to move. Friction can cause things to wear away. For example, the soles of your shoes can wear away if you run/walk alot.

What two things do you need to do work?

force and motion

parts of a lever

load, lever, force, fulcrum

Why would someone go up a curved path rather than a straight steep path?

It would take more effort and energy to go up a steep path than to walk side to side on a curved path.

Why are things with large handles easier to use?

They are easier to hold.

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