Use your hands to just push or pull a chair. You can put this another way: a force is
acting on the chair
exerting by you. It does not have to be your hands, you could use shoulders, feet or head – but it might require some ingenuity to pull as well as push.
This pushing or pulling could start the chair moving. But catching a ball is also pushing or pulling, and stops the ball moving.
Use your hand to support a carrier bag of shopping by pulling upwards, or supporting a bag of apples by pushing upwards. You're supporting the carrier bag or the apples, so these are examples of
support forces. There is a force
acting on the bags
exerted by you.
You can act on anything by
exerting a force on that thing
exert a force on a thing by pushing or pulling.
acts on the thing.
How you might be thinking