Question

1. Which one of the following is not an example of non-contact force?
a ball thrown up returns back to earth
b. falling of raindrops on earth
ciron pins attracted by a bar magnet.
d. The force exerted by a stretched spring,​

Answer 1

Answer:

Muscular force can be applied only while in contact with the object. So, it is a contact force, not a non-contact force.