Question

opening door is an exampli of =​

Answer 1

Question:-

opening door is an example of =

Answer:-

opening door is an example of force.

Explanation:-

Because a push or pull is being applied on the door, so the answer is force.

Answer 2

Answer:

contact force

Explanation:

The hinge force is another example of a contact force. Thus, considering the overall forces acting on the body we can conclude that the process of opening a door is facilitated by a contact force.