A simple machine makes work easier by helping us push, pull or lift.
Examples: a lever (like a see-saw) lifts loads; a pulley raises things with a rope and wheel; an inclined plane (a ramp) helps us move things up a slope; a wheel and axle helps things roll.
Remember
- Simple machines: lever, pulley, inclined plane (ramp), wheel and axle.
- They make work easier, not harder.