Question

Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.
Which statement is the best example of an object and motion that would make it hard for people to believe Newton’s first law?
a. A rolling ball eventually slows down and comes to a stop.
b. A wagon must be pushed before it begins to move.
c. The heavier the load in a cart, the harder the cart is to turn.
d. A box does not move when pushed equally from opposite sides.

Answer 1

Answer: B

Explanation:

Newton's first law it's law of inertia.

An object at rest will remain at rest (or an object in motion in a straight line at a constant velocity will remain that way) unless it is acted by an unbalanced force.

In A for the ball to slow down and stop, an external force (like friction with air or the floor) needs to be taken in consideration.

In B we can see how we need to make a force on the wagon to make it move.

In C we have an other Newton 's law, force equals mass times acceleration (2nd law)

In D we can see how it does not move because the forces on the box are balanced.

Answer 2

Answer: a. A rolling ball eventually slows down and comes to a stop.