Science - 3rd grade - Chapter 4 Lesson 3 What is a machine?
What two simple machines make up a nail clipper?
a lever and a wedge
What is a *complex machine*? (Also known as *compound machines*)
a machine made up of more than one simple machine
What kind of simple machine is a doorknob?
a wheel and axle
What kind of simple machine is shown in the picture?
a lever
What kind of simple machine would you use to open a can of paint?
a lever
What kind of simple machine would you use to raise a flag pole?
a pulley
incline plane
a ramp, or slanting surface, that connects a lower level to a higher level
wheel and axle
a round wheel attached to a post (axle)
What kind of simple machine is at the bottom of this light bulb?
a screw
wedge
a simple machine made from two slanted sides that end in a sharp edge
pulley
a simple machine that change the direction or amount of force needed to move an object
lever
a stiff bar that rests on a support which is used to lift and move things
What kind of simple machine would you use to cut an apple?
a wedge
What three simple machines make up the can opener?
a wheel and axle, levers, and a wedge
screw
an inclined plane wrapped around a center post
How do you know when a simple machine has done work?
force has been used and the object has moved (moving also includes cutting)
work
using force to move an object
What is *simple machine*?
A machine with one or two parts that can lessen the amount of work you do. There are six kinds of simple machines.
How do simple machines help us?
They make work easier.