inclined plane · ramp · axle · transport · gradual
The inclined plane is a flat, sloping surface like a ramp. It helps us move heavy objects from a lower level to a higher level with less effort. A gradual slope makes pushing and pulling much easier. Workers use ramps to load heavy equipment onto trucks, and people in wheelchairs use ramps to enter buildings. The wheel and axle work together as a second simple machine. The axle is a central rod that connects to the wheel and allows it to spin. Together, they transport objects easily. Cars, bicycles, and wheelbarrows all use the wheel and axle to work.