newton's laws of motion.

Question 1

what is the inertial mass?

Answer 1

measure how difficult it is to change the velocity of an object.

Question 2

what does the ratio of force over acceleration mean/ equal?

Answer 2

inertial mass.

Question 3

what is newton’s third law?
what example can be given to show this?

Answer 3

every action has an equal, opposite reaction.
person pushes a trolley.
force of person on the trolley.
force of trolley on person.