Question

what is newton’s secon...
this law states that force equals mass times acceleration. it is a mathematical equation and is written like this, f = mass × acceleration.
the mass of an object is the amount of matter in the object. an object is accelerating when it speeds up, slows down, or changes direction. it is not accelerating when it is at a constant speed and moving in the same direction.
when mass is increased, the amount of force used to accelerate the object must be increased and when mass is decreased, the amount of force required to accelerate the object is decreased.
which of the following is an example of the law of acceleration?
a train travelling a constant speed and direction
changing your force to accelerate a baseball different speeds
a car travelling east at 70 miles per hour

Explanation:

To determine the example of the Law of Acceleration (Newton's Second Law, \( F = ma \)), we analyze each option:

1. A train traveling at constant speed and direction: No acceleration (constant velocity), so not an example.
2. Changing force to accelerate a baseball at different speeds: Since \( F = ma \), changing force to change acceleration (and thus speed, as \( a=\frac{\Delta v}{\Delta t} \)) matches the law (force relates to mass and acceleration).
3. A car traveling east at 70 mph: Constant speed and direction (no acceleration), so not an example.

Answer:

changing your force to accelerate a baseball different speeds