Are forces present even when there is no movement?

Yes, gravitational force is everywhere. Even if you don't move or move, or wherever you are, there is gravitational force.

Balanced Force

Explanation:

Unbalanced forces can also stop a moving object. The three main forces that stop moving objects are friction, gravity and wind resistance. Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion.

c)as speed changes, wavelength and frequency change.

everything changes!

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )