Question

4. Name the forces in action in the following cases. [3]

(a) The force used in removing iron scrap from a heap of mixed scrap.by a

crane.

(b) The force required to open a closed door.

(c) The force exerted by a charged body on another charged or uncharged body​

Answer 1

Answer:

a) Magnetic Force

Magnetic Force or Force of attraction is used in removing iron scrap from a heap of mixed scrap.

b) contact force

Opening a door requires our hand to apply force by pushing and pulling which is a contact force. There is some frictional force in the door hinge, against that we apply force. The hinge friction is again a contact force.

c) electrostatic force

The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.

Explanation:

hope it's helpful

Answer 2

Answer:

a) Magnetic Force used in removing iron scrap from a heap of mixed scrap.

b) Frictional force must be there to open a closed door. We can say It's closed by any contact force.

c) The force exerted by a charged body on another charged or uncharged body is Electrostatic force .