How does a water dam increase the efficiency of a waterwheel

See explanation below.

Explanation:

The efficiency in this type of facility is increased by increasing the height of the water fall, in this way you will have more potential energy, which will become kinetic energy to move the wheel.

E = m*g*h

where:

m = mass of the water [kg]

g = gravity = 9.81[m/s^2]

h = elevation [m]

We can see that if we increase the height h, we increase the energy of the system.

explanation:

to push or pull an object in a certain direction is known as force. a force in moving an object from one place to another.

force depends on the mass of an object. so, more is the mass of an object more will be the force required to move the object.

thus, we can conclude that the use of force to move an object is push or pull.