Question

why did the block stop moving?
a the floor exerted a force that is opposite to the direction of the block’s motion.
b the block ran out of force.
c the floor absorbs force from the block.
d all objects stop moving because their natural state is to be still.

Explanation:

According to Newton's laws, friction is a force that opposes motion. When a block moves on a floor, the floor exerts a frictional force opposite to the block's motion, which can cause it to stop. Option a correctly describes this. Option b is incorrect as force is not something an object "runs out of". Option c is wrong since floors don't absorb force in the way described. Option d is false because an object's natural state is to maintain its current state of motion (inertia), not to be still.

Answer:

A. The floor exerted a force that is opposite to the direction of the block’s motion.