A line of dominos is knocked down. Which explanation is true?

The correct explanation is:

An increase in force caused an increase in acceleration.

This aligns with Newton's second law of motion, which states that force equals mass times acceleration (F = ma). When a domino is knocked down, the force from the previous domino causes the next domino to accelerate and fall as well. As each domino is pushed, it experiences this increase in force, leading to an increase in acceleration as they are set in motion.

When raindrops form, the force of gravity pulls them toward the ground. Which statement is correct about this chain of events?
Responses

There is no correlation between gravity and raindrops falling.

There is a negative correlation between gravity and raindrops falling.

The raindrops' acceleration causes the force of gravity.

The force of gravity causes the raindrops to accelerate.

The correct statement is:

The force of gravity causes the raindrops to accelerate.

When raindrops form, they are subject to the force of gravity, which pulls them downward toward the ground. This force results in the acceleration of the raindrops as they fall. According to Newton's laws of motion, specifically the second law, it is the force (in this case, gravity) that causes the raindrops to accelerate.

A student observes that for the same net force, heavier objects accelerate less. Which statement describes a correct conclusion?
Responses

There is a positive correlation between mass and acceleration.

An decrease in acceleration causes the mass to increase.

An increase in acceleration causes the mass to increase.

There is a negative correlation between mass and acceleration.

The correct conclusion is:

There is a negative correlation between mass and acceleration.

According to Newton's second law of motion (F = ma), for a given net force (F), an increase in mass (m) results in a decrease in acceleration (a). Therefore, as the mass of an object increases, its acceleration decreases when the net force remains constant, indicating a negative correlation between mass and acceleration.

nonzero net force acts on a moving ball, and the ball comes to a stop. Which statement is correct about the relationship between the net force and the ball's movement?
Responses

The net force causes an increase in acceleration because without the force the ball's velocity would remain the same.

An increase in acceleration causes the net force to be nonzero because causation works in both directions.

A decrease in acceleration causes the net force to be nonzero because causation works in both directions.

The net force causes a decrease in acceleration because without the force the ball's velocity would remain the same.

The correct statement is:

The net force causes a decrease in acceleration because without the force the ball's velocity would remain the same.

In this context, if a nonzero net force acts on the moving ball, it means that this force is causing a change in the ball's velocity. Since the ball comes to a stop, the net force must be acting in the opposite direction of the ball's movement, leading to a decrease in its velocity (acceleration in the negative direction). Without the net force acting on it, the ball would continue moving at its current velocity due to inertia.

A student places five books next to each other on their ends. She then pushes the first book with her finger, and a few seconds later, the last book falls. Which statement is correct about this chain of events?
Responses:

The force of the finger causes the books to accelerate and fall.

There is a positive correlation between the force of the finger and number of books.

The acceleration of the books as they fall causes the force of the finger.

There is causation between the force of the finger and the number of books.

The correct statement is:

The force of the finger causes the books to accelerate and fall.

When the student pushes the first book with her finger, that initial force is transmitted through the series of books. As a result, all the books begin to accelerate in the direction of the push, eventually causing the last book to fall. This statement accurately describes the cause-and-effect relationship in this situation.