Gravity.
The force pulling the bucket down is the force of gravity. It is equal to the weight of the bucket, which is given by the mass of the bucket multiplied by the acceleration due to gravity.
The force pulling the anvil down would be gravity.
If it is held stationary, there will be the downward force of gravity, and the upward (normal) force from your hand. The reason that the bucket does not move is because the forces are equal and opposite.
The balanced forces acting on a stationary bucket would be the force of gravity pulling the bucket downwards and the normal force exerted by the surface supporting the bucket pushing upwards. These two forces are equal in magnitude and opposite in direction, keeping the bucket in equilibrium.
Gravity, which force will equal the weight of the books
The force pulling you down to the ground is gravity, a natural phenomenon by which all physical bodies attract each other.
You cannot lift a bucket of water without holding it because you need to apply a force to overcome the weight of the bucket and the water inside it. If you do not hold it, the force of gravity will cause it to fall back down. Holding the bucket allows you to apply the necessary force to lift it.
The upward force is equal in magnitude to the pulling force. This is because of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. So the force pulling an object up is equal to the force pulling it down.
The tension force in the cord that is pulling the light up is equal in magnitude but opposite in direction to the force of gravity pulling the light down. This balance of forces causes the light to remain stationary in its position.
graverty
Gravity . . . pulling you down. The scale . . . pushing you up. If these two forces were not equal, then there would be a net force on the bottom of your feet, either upward or downward, and you would be accelerating.
gravity