If you sit on it, you push downward. The bicycle seat naturally pushes back up - if this wasn't the case, you would accelerate downward, due to the force of gravity.
opposite and equal force against you.
do you exert more force when you are further from the fulcrum
The force that you exert on a lever can be called the effort force. The lever has three parts. They are: the fulcrum, the load, and the effort force. This can also be classified as the input force. The force that you exert to perform a task is known as the input force.
input force
You exert force when you pull on anything.
That'd be a quadricycle or a quadra bike or something like that. Maybe even a pedal car.
opposite and equal force against you.
Simple machines are things that change the direction or magnitude of a force. A bicycle saddle doesn't do that, so no.
do you exert more force when you are further from the fulcrum
The objects with bigger masses exert more pulling force. However, even though all the matter around us exert a force, their masses are too small for them to exert a 'feelable' force. But yes, they do exert a force, but its negligible.
The force that you exert on a lever can be called the effort force. The lever has three parts. They are: the fulcrum, the load, and the effort force. This can also be classified as the input force. The force that you exert to perform a task is known as the input force.
input force
They exert Gravitational Force on each other. It is a force which is directly proportional to Mass of the object
Both, you exert a force onto the sidewalk, and the sidewalk "pushes back" with an equal, but opposite force.
Could you please clarify how you would like to adjust your bicycle seat?
tension , compression and friction
You exert force when you pull on anything.