i have 5 ridles my teacher posts and i was wonder if somebody could help me and put in some adivce/tips. 1. If we push a crate at constant velocity, how do we know how much friction acts on the crate compare to our pushing force? 2. Give an example of something moving when a net force of zero acts on it. 3. When you weigh yourself, are you actually reading the support force acting on you, or are you really reading your weight? 4. When only a pair of equal and opposite forces act on an object, what is the net force acting on it? 5. How much tension is there in a rope that holds a 20-N bag or apples at rest? go nuts guys!!