If the ramp was not there, the cow would have had a lot of trouble going up and down with the ball. A scale is a lever with two buckets at the end of two ropes. The long line at the bottom is the fulcrum. In my picture you can see the dog weighs more the cat . You can see that because the dogs bucket is going down.
Scales are a type of work.
Our simple machine is the wheel and axle . It is on a scooter. Wheels and axles make wheels turn round and round. The screw is an inclined plane . A screw keeps two pieces of wood together .