Even and smooth
flat
The rod that goes through the center of a wheel.
axle
What machine do you see here?
a wheel and axle
To move in a circle around a center or axle.
roll
Name one machine you see here?
a screw or a lever
What simple machine do you see here?
an inclined plane
What machine do you see here?
a screw
What machines are these?
a pulley
What machine do you see here?
an inclined plane
What machine do you see here?
a wedge
A round object which turns around a fixed point or axle.
wheel
Something heavy that is carried someplace.
load
Why do people use a wheel and axle?
They turn and roll hard on a flat surface.
They turn and roll easy on a flat surface.
They turn and roll hard on a rough surface.
A basic or simple device that changes the directions or size of a force.
Simple machine
What machine do you see here?
a lever