Is tension always present?

1. Is tension always up?
2. Can there be 0 tension?
3. Does tension exist?
4. Can there be normal and tension force?

Is tension always up?

That "pull" is a force which we give the name tension. Thus, tension will point away from the mass in the direction of the string. In the case of the hanging mass, the string pulls it up, so the string exerts an upward force on the mass, and the tension will be upwards.

Can there be 0 tension?

Zero tension is slack. A string or rope is often idealized as one dimension, having length but being massless with zero cross section.

Does tension exist?

Thus, the tension will point away from the mass in the direction of the string/rope. In case of the hanging mass, the string pulls it upwards, so the string/rope exerts an upper force on the mass and the tension will be in the upper side. ... Acceleration and net force always exist together.

Can there be normal and tension force?

As noted in the text, the normal force and the tension force can only act in one direction: the normal force can only push, and the tension force can only pull.