Acontact force exist between two interacting objects that physically contact each other. a non-contact force exist when two interacting objects are not in physical contact but can still influence each other.
true or false

Explanation:

Contact force is defined as the force a pair of objects experience when they are in contact.

Ex.normal force,friction.

Non-contact forces are defined as the forces a pair of objects experience even if they are not in contact.

Ex.electric force,magnetic force.

Given that a contact force exist between two interacting objects that physically contact each other. A non-contact force exist when two interacting objects are not in physical contact but can still influence each other.

So,the given statements are true.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.